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（请给出正确答案）
[单选题]
Water is said to ________ of oxygen and hydrogen.
A.insist
B.consist
C.constitute
D.institute
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题目内容
（请给出正确答案）
A.insist
B.consist
C.constitute
D.institute
答案
更多“Water is said to ________ of oxygen and hydrogen.”相关的问题
第1题
What is said about global climate models？
A．They are very useful in weather prediction.
B．They can give us all the information we need.
C．They cannot simulate everything we need to know.
D．They are particularly accurate when simulating water vapor.
第2题
What is said about the rainfall in America's West？
A．There is much more rainfall in California than in Utah.
B．The water it delivers becomes lighter when it moves inland.
C．Its chemical composition is less stable than in other areas.
D．It gathers more light isotopes as it moves eastward.
第3题
What is said about the rainfall in America’s West？
A) There is much more rainfall in California than in Utah.
B) The water it delivers becomes lighter when it moves inland.
C) Its chemical composition is less stable than in other areas.
D) It gathers more light isotopes as it moves eastward.
第4题
Questions下列各are based on the following passage. A bull grazes on dry wheat husks(Phi) in Logan, Kansas, one of the regions hit by the record drought that has affected more than half of the U. S. and is expected to drive up food prices. Leadinu water scientists have issued one of the sternest warnings yet about global food supplies, saying that the worlds population may have to switch almost completely to a vegetarian diet over the next 40 years to avoid catastrophic shortages. Adopting a vegetarian diet is one option to increase the amount of water available to grow more food in an increasingly climate-unstable world, the scientists said. Animal protein-rich food consumes 5 to 10 times more water than a vegetarian diet. One third of the worlds arable(适于耕种的) land is used to grow crops to feed animals. Other options to feed people include eliminating waste and increasing trade between countries in food surplus and those in deficit. "900 million people already go hungry and 2 billion people are malnourished in spite of the fact that per capita food production continues to increase," they said. "With 70% of all available water being in agriculture, growing more food to feed an additional 2 billion people by 2050 will place greater pressure on available water and land. " The report is being released at the start of the annual world water conference in Stockholm, Sweden, where 2,500 politicians, UN bodies, non-governmental groups and researchers from 120 countries meet to address global water supply problems. Competition for water between food production and other uses will intensify pressure on essential resources, the scientists said. "The UN predicts that we must increase food production by 70% by mid-century. This will place additional pressure on our already stressed water resources, at a time when we also need to allocate more water to satisfy global energy demand--which is expected to rise 60% over the coming 30 years--and to generate electricity for the 1.3 billion people currently without it," said the report. Overeating, undernourishment and waste are all on the rise and increased food production may face future constraints from water scarcity. "We will need a new recipe to feed the world in the future," said the reports editor, Anders Jagerskog. A separate report from the International Water Management Institute (IWMI) said the best way for countries to protect millions of farmers from food insecurity in sub-Saharan Africa and south Asia was to help them invest in small pumps and simple technology, rather than to develop expensive, large-scale irrigation projects. "Farmem across the developing world are increasingly relying on and benefiting from small-scale,locally-relevant water solutions. These techniques could increase yields up to 300% and add tens of billions of U. S. dollars to household revenues across sub-Saharan Africa and south Asia. " said Dr. Colin Chartres, the director general. What can be inferred from the water scientists warning？
A.The record drought forces half of the U. S. to go hungry.
B.The record drought drives up food prices m the U. S.
C.Severe food shortage may happen without proper measures.
D.A vegetarian diet is the only option to avoid disastrous shortages.
第5题
Passage Two
Questions 62 to 66 are based on the following passage.
Scientists have devised a way to determine roughly where a person has lived using a strand(缕) of hair , a technique that could help track the movements of criminal suspects or unidentified murder victims .
The method relies on measuring how chemical variations in drinking water show up in people’s hair.
“You’re what you eat and drink, and that’s recorded in you hair,” said Thure Cerling, a geologist at the University of Utah.
While U.S diet is relatively identical, water supplies vary. The differences result from weather patterns. The chemical composition of rainfall changes slightly as raid clouds move.
Most hydrogen and oxygen atoms in water are stable , but traces of both elements are also present as heavier isotopes (同位素) . The heaviest raid falls first .As a result, storms that form. over the Pacific deliver heavier water to California than to Utah.
Similar patterns exist throughout the U.S. By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can construct a geographic timeline. Each inch of hair corresponds to about two months.
Cerling’s team collected tap water samples from 600 cities and constructed a mop of the regional differences. They checked the accuracy of the map by testing 200 hair samples collected from 65 barber shops.
They were able to accurately place the hair samples in broad regions roughly corresponding to the movement of raid systems.
“It’s not good for pinpointing (精确定位),” Cerling said . “It’s good for eliminating many possibilities.”
Todd Park, a local detective, said the method has helped him learn more about an unidentified woman whose skeleton was found near Great Salt Lake.
The woman was 5 feet tall. Police recovered 26 bones, a T-shirt and several strands of hair.
When Park heard about the research, he gave the hair samples to the researchers. Chemical testing showed that over the two years before her death, she moved about every two months.
She stayed in the Northwest, although the test could not be more specific than somewhere between eastern Oregon and western Wyoming.
“It’s still a substantial area,” Park said “But it narrows it way down for me.”
62. What is the scientists’ new discovery？
A) One’s hair growth has to do with the amount of water they drink.
B) A person’s hair may reveal where they have lived.
C) Hair analysis accurately identifies criminal suspects.
D) The chemical composition of hair varies from person to person.
第6题
Water Warnings
Urgent Tasks for China
Water has long been considered an inexhaustible resource. But China is facing an unmistakable water crisis, and recently, because of increasingly hard-to-miss symptoms of the shortage, people in all parts of society are beginning to realize just how precious commodity water really is.
At first glance, it seems like there should be enough: China's total supply of freshwater resources ranks sixth in the world, after Brazil, Russia, Canada, the United States and Indonesia. But despite this apparent advantage, China's per capita water resources fall far below the world average of 7,600 cubic meters per-capita due to the country's enormous population size. China's per-capita amount of 2,200 cubic meters is expected to decrease further as the country continues its rapid economic growth and population expansion.
"Without excessively exploiting underground water, China has a water gap of nearly 40 billion cubic meters. The country's 320 million rural people aren't able to drink safe water and over 400 cities don't have sufficient water supply, 110 of which face a serious shortage," Wang Shucheng, Minister of Water Resources, said recently.
Some water resources experts warn that the current shortage is no more than a warning signal, with a greater crisis yet to come. The Ministry of Water Resources issued a water crisis warning as early as November 2001. At the time it said that when the Chinese population peaks at 1.6 billion in 2030, China's per-capita water resources could fall to 1,700 cubic meters, the internationally acknowledged level below which an area is said to be experiencing "water stress".
Poor Natural Conditions
Scant water resources to slake the thirsts of a population of 1.3 billion, and the uneven geographical distribution of these resources, form. the basis of water conditions in China.
Affected by monsoons (季候风), China's precipitation (降水量) varies considerably among different
seasons. The time of precipitation overlaps (交迭) with the hottest seasons, mostly in summer and autumn and scarcely in winter and spring. Generally, regions with the lowest precipitation levels receive it concentratedly only at certain times of the year, which easily gives rise to drought in spring and flooding in summer. Meanwhile, two thirds of China's water resources is comprised of runoff flooding, which means rivers often flood in the rainy season and dry up at other times.
China's water resources are also distributed geographically unevenly, inconsistent with the distribution of land, mineral resources and productivity. Generally, water resources are concentrated in the southern and eastern parts of the country, and in mountainous areas. Annual precipitation amounts vary from more than 3,000 millimeters in the southeast to less than 50 millimeters in the northwest.
China is prone to floods and droughts, such-as the severe drought that hit Chongqing and Sichuan in southwest China this summer, the country's worst in 50 years. While per capita water resources in some areas of the north approach the level of the driest countries in the world, the water-rich south often suffers from seasonal droughts, which adversely affects rice, the major crop reliant on watering, as well as other cash crops. The last two decades have seen a nominal change in the country's surface water resources and total water resources. Yet clue to factors such as global climate change and river drainage, and total water resources in south China are rising while water resources in the north are falling significantly.
A Series of Measures Adopted by Chinese Government
Against these difficult conditions, the Chinese Government has taken a series of measures to try and guarantee the basic water demands necessary for daily life and social and economic development. Since the founding of t
A．Y
B．N
C．NG
第7题
The ant looked up and saw the young girl sitting in front of a huge pile of seeds.
“Why are you sad？” asked the ant.
“I'm the prisoner of a giant.”the girl told the ant.“He won't let me go until I've made three separate heaps of grain, barley(大麦)and rye(黑麦)out of this huge pile of seeds in which they are all mixed together.”
“That will take you a month!” the ant said, looking at the huge pile of seeds.
“I know,”the girl cried, “and if I haven't finished by tomorrow, the giant will eat me for his supper!”
“Don't cry,”the ant said, “my friends and I will help you.”
Soon thousands of ants were at work, separating the three kinds of seeds.
The next morning, when the giant saw that the work had been done, he let the girl go.
Thus it was one of her tears that saved her life.
6.The ant was playing when it ran here and there.()
A.T
B.F
7.The drop of water fell on the ant when it was nearly dying.()
A.T
B.F
8.The young girl was crying because she wanted to have supper.()
A.T
B.F
9.The giant would eat the girl if she failed to do the work.()
A.T
B.F
10.The ant's friends saved the girl's life.()
A.T
B.F
第8题
Passage One
Amazon rain forest, normally one of the world's wettest regions, shows the weather cycle is swinging to one extreme rather than signaling climate change, local meteorologists said Thursday. Water levels on two major Amazon tributaries, Madeira and Solimoes, dropped to record--38-year lows respectively, creating long delays in fiver traffic, the main form. of regional transport.
Dry weather also fanned huge forest fires, notably in the remote western State of Acre. But weather forecasters added that elsewhere in continentally sized Brazil, seasonal spring rains had started in the south and were spreading northwards through Brazil's major coffee belt and gradually into soybean areas in the center-west. "The Amazon drought shows extreme climate variability, not climatic change," said Jose Marengo, researcher at the Weather Forecasting and Climatic Studies Center, part of the National Institute of Space Research. Marengo said that normal rains were forecast for the south Amazon --the States of Acre and Rondonia, southern part of Para State and northern part of Mato Grosso State.
"Rain is forecast in Acre in the next couple of weeks," he said, adding that the region is normally dry between June and September and wettest in December and January. But we are a bit worried that there could be less rain than usual at the mouth of the Amazon, around Belem, he said, noting that extreme climatic events were occurring more frequently, "We could be seeing the first symptoms of changing cycles." Meteorologists discounted a link between unusually severe hurricanes in the Gulf of Mexico and drought in the Amazon.
Dry weather in the Amazon is linked to warmer ocean surface temperatures in the Pacific and to low sunspot activity, said Expedito Rebello, head of applied meteorology at the government's National Institute of Meteorology in Brasilia. "It's a phenomenal (不同寻常的) drought and could be linked to a warmer Pacific and little sunspot activity," Rebello said, noting extremely low water levels in the Amazon. But he added that the weather cycle would reach a low next year and then start to moderate. Paulo Etchitchury, director of private meteorologists Somar, said that the Pacific should start to enter a cooler period next Brazilian summer and this could result in a weak La Nina weather pattern. "It won't affect summer rains and it's still very early to talk about next winter," he said, adding that La Nina doesn't necessarily signal a cold winter and extra risk of frost damage to Brazil's coffee crop, the world's biggest.
Brazil was in a transitional period between the dry May/August winter and rainy spring which started in south Brazil in September, Etchitchury said. He said that this year weather conditions are in general seasonally normal in Brazil's main farming areas, except that drought in the Amazon could affect Mate Grosso, Brazil's main soy state. "Rains in the south are replenishing (补充) a water deficit and providing reserves for summer soy and com harvests," he said, adding, "Last September was hot and dry and people were worried about drought damage to crop flowering."
Passage Two
Even today, many experts say women scientists are often not treated fairly. The Washington Post newspaper reported a study about the number of research articles published in medical magazines in which a woman was the main writer. Women were the main writers only twenty-nine percent of the time. Nancy Andreasen is a scientist at the University of Iowa. Scientists like Miss Andreasen often send stories about their research to special professional publications. Miss Andreasen says her research is published more often when she signs them as N.C. Andreasen rather than Nancy Andreasen. In that way, the editors of the publications do not know if the writer is a man or a woman.
Women also receive fewer patents for their inventions. A p
A．Y
B．N
C．NG
第9题
听力原文：M: Good morning, Jill. Welcome to our program.
W: Thanks, Richard.
M: It is said that you have quite a few hobbies.
W: Yes, Richard. To be frank, I am interested in doing a lot of different things. Some of them have turned out to be my hobbies.
M: Great! Can you share with us this moment？
W: My pleasure. I used to spend much of my available free time surfing the web and creating web pages, but these days I don't.
M: Then what do you do these days？
W: I go camping, hiking, canoeing with my friends because it is warm and nice these days. You know, I like doing some outdoor sports. And I love the water, so living by the sea affords a lot of opportunities for boating, sailing, water skiing, and of course, girl watching.
M: Oh, you are a sportsman. What else？
W: I also like skating on the real ice. That's a fantastic feeling just like flying. Have you tried？
M: I dare not. I'm not as brave as you.
W: Ah, then I have my chance to show you my skill. While at home and not absorbed in the WWW, I like to garden and wander around my house getting little accomplished.
(23)
A．Richard hosts' the program.
B．Jill has many hobbies.
C．Richard is a sportsman.
D．Jill is brave.
第10题
The bee has a "compound" eye, which is used for navigation. It has 15,000 facets that divide what it sees into a pattern of dots, or mosaic. With this kind of vision, the bee sees the sun only as a single dot, a constant point of reference. Thus, the eye is a superb navigational instrument that constantly measures the angle of its line of flight in relation to the sun. A bee's eye also gauges flight speed. And if that is not enough to leave our 20/20 "perfect vision" paling into insignificance, the bee is capable of seeing something we can't ultraviolet light. Thus, what humans consider to be "perfect vision" is in fact rather limited when we look at other species.
However, there is still much to be said for the human eye. Of all the mammals, only humans and some primates can enjoy the pleasures of color vision.
The Snellen eye chart measures one's eyesight by ______.
A．the number of lines he reads
B．the number of letter he reads
C．the distance he stands away from the chart
D．the speed at which he recognizes the letters
