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Frogs are important in the ecosystem because they control pests.
A．Y
B．N
C．NG
答案
更多“Frogs are important in the ecosystem because they control pests.A．YB．NC．NG”相关的问题
第1题
South America Located mostly(most) in the southern half of the earth, South America is a very（41）_____(interest) continent. The northern part of the continent is（42）_____(cover). By the Amazon Rainforest, which is home to thousands of the plant animal species. It is a very important force（43）_____(shape) the world's weather and climate patterns. And it is also important for the（44）_____(develop) of the economy of South America. Products such as chocolate, rubber, coffee and many kinds of medicine are（45）_____(harvest) from the plants found in the rainforest. Even the liquid from the skin of some species of tree frogs are being used as（46）_____(experiment) medicines. Other parts of South America are very（47）_____(differ).The Andes Mountains spread over the（48）_____(west) part of South America. The ranges, about 5500 miles long, are a continuous barrier, with many peaks rising beyond 2000（49）_____(foot). Southern South America is an extremely（50）_____(wind) and cold place where many species of penguins（企鹅）, seals and whales live. _____
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第2题
Biologists are unable to explain why frogs are dying.
A．Y
B．N
C．NG
第3题
Frogs and toads are usually poisonous.
A．Y
B．N
C．NG
第4题
An acidic environment is favorable to .
A. frogs
B. bacteria
C. oxygen-consuming plants
D. algae and fungal growth
第5题
Shoichi knew that Japan had lost the war, but the humiliation of defeat kept him from surrendering. So he stayed in the jungle, living on what he could search out. He ate mostly insects, snails, frogs and rats.
In 1972, U.S. authorities finally convinced Shoichi to "surrender". He was sent back to his homeland. Shoichi's returning home attracted a lot of attention. When a department store in Tokyo exhibited his jungle clothes and tools, more than 350,000 curious people came to view them. After spending some time back in civilization, Shoichi met a forty-five years old widow. The old soldier and the widow fell in love and married. After their wedding, the couple took a honeymoon trip to the island of Guam.
(30)
A．The island of Guam.
B．The battles on Guam during World War II.
C．Yokoi Shoichi's marriage.
D．A Japanese soldier who hid on Guam.
第6题
听力原文： One of the greatest mysteries of nature is the instinct to migrate. Every year, millions of creatures feel the need to migrate and most people have seen the arrival or departure of migrating flocks of birds. In England, for example, we always know when Autumn is coming, because flocks of swallows sit on the telegraph wires. Migration is not only seen in birds but also in reptiles, for example, turtles, frogs and toads. Insects, such as locusts and butterflies; fish, such as eel, salmon and tunas and mammals, such as reindeer, seals, lemmings, whales and bats. Many of these creatures can find their way over long distances. And how they do it is a mystery and a wonder to everyone, especially for those of us who have difficulty even reading a map covering 100 miles. There are several suggestions about how they navigate. Firstly, it is suggested, they navigate by using stars and planets for guidance. Secondly, some people think that these migrating mammals find their way by following the pole of the earth's magnetic field. Thirdly some people think that migrating birds, insects and animals follow a certain smell or scent. Fourthly, another group of people believe that animals migrate by recognizing geographical features. Fifthly, some people think that animals migrate by following changes in temperature. And finally, there are people who suppose they migrate by following sound.
(30)
A．The weather gets hotter.
B．Telegraph wires stand still.
C．Swallows sit on telegraph wires.
D．People find the mystery of migration
第9题
A．To Jean, friendship is more important than life.
B．To Jean, friendship is more important than love.
C．To Jean, friendship is more important than anything else.
D．To Jean, friendship is more important than family members.
