16. Estimates _____ anywhere from 600 000 to 3 million. Although the figure may vary, analysts do agree on another mater: that the number of the homeless is increasing. One of the federal government’s studies predicts that the number of the homeless will reach nearly 19 million by the end of this decade.
[A] cover [B] change [C] differ [D] range
17. As time went by, computers became smaller and more powerful, and they became “personal” too, as well as institutional, with display becoming sharper and storage _____ increasing.
[A] ability [B] capability [C] capacity [D] faculty
18. It soon becomes clear that the interior designer’s most important basic _____ is the function of the particular space. For example, a theater with poor sight lines, poor sound-shaping qualities, and too few entries and exits will not work for its purpose, no matter how beautifully it might be decorated.
[A] care [B] concern [C] attention [D] intention
19. The purpose of non-REM sleep is even more mysterious. The new experiments, such as those _____ for the first time at a recent meeting or the society for Sleep Research in Minneapolis, suggest fascinating explanations for the purpose of non-REM sleep.
[A] maintained [B] described [C] settled [D] afforded
20. Changes in the social structure may indirectly _____ juvenile crime rates. For example, changes in the economy that lead to fewer job opportunities for youth and rising unemployment in general make gainful employment increasingly difficult to obtain.
[A] affect [B] reduce [C] check [D] reflect
参考答案：
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