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  3. Climate, more than any other single factor, determines the distribution of life on Earth. Climatic boundaries establish the limi

Climate, more than any other single factor, determines the distribution of life on Earth. Climatic boundaries establish the limi

admin2010-05-26  38
问题     Climate, more than any other single factor, determines the distribution of life on Earth. Climatic boundaries establish the limits within which organisms can survive. Plants, even more than animals, must be well adapted to climate in order to survive. They cannot move about or take shelter but must be equipped to endure whatever weather conditions are likely to occur. In the harsh conditions of the tundra (苔原), for example, low growing mosses, lichens, and a few flowering plants all hug the ground for shelter from icy winds.
    Animals, despite their ability to move about and find shelter, are just as much influenced by climate as plants are. Creatures such as the camel and the penguin are so highly specialized that they have an extremely  limited distribution. Others, such as bears, are flexible enough to adapt to a broad range of climates.  Ocean-dwelling organisms are just as sensitive to climatic changes-- in this case temperature and salinity—as land animals. Reef corals (珊瑚) can survive only in clear warm seawater. Certain foraminifers  are so sensitive to changes in their environment that their presence can be taken as an index of sea temperature. Human beings are among the least specialized of all animals and can bye almost anywhere. Their clothes and their homes act as a sort of "miniature climate" that can be taken with them everywhere.
It can be inferred from the passage that "foraminifers" are a______.
选项 A、kind of weather pattern
B、form of sea life
C、species of tundra plant
D、type of miniature penguin
答案B
解析 推断题。本题问的是：我们能从文章中推断出有孔虫是一种______。依据文章第 2段倒数第3句“Certain foraminifers are sensitive to changes in their environment that their presence can be taken as an index of sea temperature”可知，有孔虫对周围环境极为敏感，它的出现可以被视为海水温度的一种标志。由此可见，有孔虫应该是一种海洋生物。故选B 。
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