2. 外语
  3. There are approximately three quarters of a ton of termites (白蚁) for every person on Earth. It now turns out that these critters

There are approximately three quarters of a ton of termites (白蚁) for every person on Earth. It now turns out that these critters

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问题     There are approximately three quarters of a ton of termites (白蚁) for every person on Earth. It now turns out that these critters (生物) may be helping to alter the climate and affect man’s life.
    For years scientists have been saying that carbon dioxide sent into the atmosphere by the burning of fuels might lead to the rise in temperatures of the whole earth, owing to the greenhouse effect in which the gas prevents the escape of heat into outer space. Now an international team of researchers has discovered that termites generate more than twice the carbon dioxide that fuel burning does. And this production, which comes from the insects’ eating and consuming of different kinds of vegetables and wood has risen greatly. This is chiefly because man has cut so many trees in order to open more land and thus has provided large quantities of food for the insects in the form of tiny pieces of wood.
    The output from the burning of fuels is of greater concern, however, because it is continuing to rise steadily and so far no effective measures have been taken to reduce the amount of carbon dioxide produced in this way. Production by termites, on the other hand, is not likely to increase much more.
From the passage we know that "the greenhouse effect" is an effect in which______.
选项 A、low temperatures are created by using a house
B、the house is made green in order to keep heat
C、heat is prevented from escaping outside
D、everything is kept green in a house
答案C
解析 本题问从文章中我们可以了解到温室效应是一种什么效应。根据文章第二段的内容，多少年来，科学家们不断告诉人们，燃料燃烧释放到大气中的二氧化碳会导致整个地球温度升高，这是由于该气体的温室效应可以阻止热量向外层空间释放。由此我们可以推知温室效应是一种可以阻止热量向外层空间释放的效应。因此，本题的正确答案应是C。
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