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  3. When you imagine the desert, you probably think of a very hot place covered with sand. Although this is a good description for m

When you imagine the desert, you probably think of a very hot place covered with sand. Although this is a good description for m

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问题     When you imagine the desert, you probably think of a very hot place covered with sand. Although this is a good description for many deserts, Earth’ s largest desert is actually a very cold place covered with ice Antarctica.
    In order for an area to be considered a desert, it must receive very little rainfall. More specifically, it must receive an average of less than ten inches of precipitation—which can be rain, sleet, hail, or snow—on the ground every year. Antarctica, the coldest place on earth, has an average temperature that usually falls below the freezing point. And because cold air holds less moisture than warm air, the air in Antarctica does not hold much moisture at all. This is evident in the low precipitation statistics recorded for Antarctica. For example, the central part of Antarctica receives an average of less than two inches of snow every year. The coastline of Antarctica receives a little bit more—between seven and eight inches a year.     Because Antarctica gets so little precipitation every year, it is considered a desert.
    When precipitation falls in hot deserts, it quickly evaporates back into the atmosphere. The air over Antarctica is too cold to hold water vapor, so there is very little evaporation. Due to this low rate of evaporation, most of the snow that falls to the ground remains there permanently, eventually building up into thick ice sheets. Any snow that does not freeze into ice sheets becomes caught up in the strong winds that constantly blow over Antarctica. These snow-filled winds can make it look as if it is snowing. Even though snowfall is very rare there, blizzards are actually very common on Antarctica.
The main purpose of Paragraph 1 is to_____ .
选项 A、accept a conclusion
B、introduce an argument
C、provide a brief history
D、deny a common belief
答案D
解析 作者在第一段中说当人们想到沙漠时，通常会认为沙漠肯定是由沙子覆盖、非常炎热的地方。但这种通常的想象并不适合南极洲。所以选项D(否认普遍的认识)是正确的。第一段并未给出任何结论或展示某一论点。所以，选项A(接受结论)、选项B(介绍论点)和选项C(提供简史)都是不正确的。
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