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The coastal areas were occupied by the ______ of Greek colonists.
A．ancestors
B．descents
C．tribes
D．descendants
答案
更多“The coastal areas were occupied by the ______ of Greek colonists.A．ancestorsB．descentsC．tr”相关的问题
第2题
The coastal areas were occupied by the ______ of Greek colonists.
A．ancestors
B．descents
C．tribes
D．descendants
第3题
Coping with Climate Change
What we have learned so far about how climate changes is affecting our global environment. Studies show that it adversely affects human and natural systems by reducing biodiversity, impairing biological and chemical cycles and making it more difficult to restore degraded ecosystems.
Climate is not the only factor in the deterioration of natural systems. We are making big changes to the landscape, altering land use and land cover in major ways. These changes combined present a challenge to environmental management. Adaptive management is a scientific approach to managing the adverse impacts of climate and landscape change.
Nature and Impacts of Climate Change
Every week it seems there is an article about global warming in the news media. It may be difficult for some to grasp the big picture of the issue, but in general, climate change has already or is expected to
？increase temperatures, particularly in the interior of continents, toward the poles and in winter
？boost precipitation (降水量) in wetter areas and suppress precipitation in drier areas
？increase rain and decrease snow
？lessen peak spring runoff and cause more even year-round flows of water, thereby reducing water availability during summer irrigation and navigation seasons
？increase evaporation of water during the summer
？enhance the likelihood of lower mean lake levels, drier wetlands, and water shortages, particularly in mountain regions
？raise the frequency and magnitude of extreme weather events, such as hurricanes, tornadoes, and floods
？raise global sea levels, causing some populated coastal areas to become inundated (被淹没的)
？reduce the extent and duration of Arctic sea ice with adverse consequences for marine mammals
？increase the loss of glaciers in middle and equatorial latitudes, including premier mountain ecosystems such as Glacier National Park in Montana
Global average temperature has increased by about 0.6℃ over the past 100 years, with a major warming upswing in the 1970s. Warming is the result, in part, of rapid increases in emissions of greenhouse gases (GHG), particularly carbon dioxide (CO2), which is a byproduct of the combustion of fossil fuels, such as coal, oil, and natural gas, used for power generation and transportation.
When global temperatures rise and precipitation patterns change, it is expected there will be consequences on ecosystems, such as an increase in the spread of exotic species; redistribution of plants, animals, energy, water, and nutrients; alteration of natural processes and the structure and function of ecosystems.
Northerly latitudes are particularly vulnerable to climate change. The Arctic Council, an intergovernmental forum for Arctic nations and indigenous people, reported that the northern ice cap is warming at twice the global rate and the Arctic region is expected to warm at two to three times the rate for the rest of the world. Arctic warming will have serious consequences on human and ecology.
Nature and Impacts of Landscape Change
Landscape change results from natural disturbances and human activities. Natural disturbances include fire, windstorms, avalanches, landslides, tree fall, floods, and insect epidemics. Human activities causing landscape change include conversion of forestland to agriculture, drainage of wetlands, and forest fragmentation from road construction and timber harvesting.
Human activities often have a more significant effect on landscapes than natural disturbances because they alter the availability of energy, water, and nutrients to ecosystems; increase the spread of exotic species; accelerate natural processes of ecosystem change; and adversely affect the structure and functioning of ecosystems.
A．Y
B．N
C．NG
第4题
What can we learn from this passage about the U.S. Gulf Coast？
A. Most of the world's major oil and gas facilities are located there.
B. It is an ideal location for many offshore and coastal energy facilities.
C. It is vulnerable to extreme weather events caused by climate change.
D. Hurricane Katrina damaged many facilities there and forced them to relocate.
第5题
What can we learn from this passage about the U.S. Gulf Coast？
A.Most of the worlds major oil and gas facilities are located there.
B.It is an ideal location for many offshore and coastal energy facilities.
C.It is vulnerable to extreme weather events caused by climate change.
D.Hurricane Katrina damaged many facilities there and forced them to relocate.
第6题
A.at
B.for
C.on
第7题
If the salinity(含盐量) of ocean waters is analyzed, it is found to vary only slightly from place to place.Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation--conversion of liquid water to water vapor. In this manner, the salinity is increased, since the salts staybehind. If this is carried to the extreme, of course, white crystals of salt would be left behind.
The opposite of evaporation is precipitation(降水), such as rain, by which water is added to the ocean. Here the ocean is being diluted(稀释) so that the salinity is decreased. This may occur in areas of high rainfall or in coastal regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation or runoff(形成地表水部分的降水).
Normally, in tropical regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions whererivers dilute the sea, salinity is somewhat lower than in other oceanic areas.
A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water.
In the Weddell Sea, off Antarctica, the densest water in the oceans is formed as a result of this freezingprocess, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portions of the oceans of the world.
Choose correct answers to the question: The best title of the passage can be “_____”.
A.Typical Oceans and Their Respective Features
B.The Causes of the Changes in Salinity of Ocean Water
C.Different Oceans Have Different Salinity
D.The Precipitation and Evaporation of Oceans
Which of the following processes will increase salinity of ocean waters？A.Evaporation.
B.Precipitation.
C.Melting.
D.Dilution.
According to this passage, the sea _ is likely to have the lowest salinity.A.in tropical areas
B.off Antarctica
C.of high rainfall
D.with abundant
The Weddell Sea _____.
A.is a good example of increased salinity in freezing sea water
B.is much larger in area than the Arctic oceans
C.has a much lower salinity now than ever
D.has the denser water in its upper parts
Coastal regions are mentioned as cases where _____.A.sea water is less salty because fresh water joins in
B.rivers carry industrial exhaust into sea
C.sea ice tends to melt more quickly than in the center of oceans
D.heavy water sinks to the deeper portions of the oceans
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第8题
From the passage we know that the security measures taken by Metro are ______.
A．in the wake of the Madrid bomb blasts
B．not visible to the passengers or passers-by
C．extensive in its coverage of public areas
D．various ranging from the use of dogs to the access to FBI
第9题
We can infer from the passage that______.
A．there is little difference between specialization and professionalisation
B．amateurs can compete with professionals in some areas of science
C．amateurs have national academic societies but no local ones
D．professionals welcome amateurs into the scientific community
第10题
Although we all depend on the resources of nature for our survival, _______.
A．industrial products are replacing all our natural resources
B．it is only on islands that nature survives
C．we have forgotten what our original countryside looked like
D．we have allowed large areas of countryside to be spoilt by industrial development
第11题
Although we all depend on the resources of nature for our survival, ______.
A．industrial products are replacing all our natural resources
B．it is only on islands that nature survives
C．we have forgotten what our original countryside looked like
D．we have allowed large areas of countryside to be spoilt by industrial development
