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  3. One reason human beings can thrive in all kinds of climates is that they can control the qualities of their in the enclosed spac

One reason human beings can thrive in all kinds of climates is that they can control the qualities of their in the enclosed spac

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问题   One reason human beings can thrive in all kinds of climates is that they can control the qualities of their in the enclosed spaces in which they live．Air conditioning is the use of mechanical systems to【1】that control in s1Jch places【2】homes，offices，theaters，institutions，factories，airplanes，and automobiles．The most familiar type of air conditioning is summertime cooling．Although important，this is ________one of several aspects of air conditioning．Other applications【4】the control of the humidity  (or air moisture)，cleanliness，circulation of the air，and heating．
  Tests have【5】that people generally feel best【6】certain temperature，humidity，and air velocity conditions．Temperatures can【7】from 21．5℃ with 70 percent relative humidity to 28℃with 30 percent relative humidity．Relative humidity is the【8】of moisture in the air【9】 a specific temperature compared【10】the amount it could hold at that temperature．【11】air velocities range from 4．5 to 10．5 meters per minute．It is also desirable that an air conditioner【12】dust，pollen，smoke，and odors from the air．
  In many industrial environments，air conditioning is essential．Most print shops，for example，【13】constant humidity in order to control paper shrinkage and 【14】the 【16】operation in some processes．Libraries，especially ones with rare books，require air control to【16】the physical quality of their collections．Bakeries and the tobacco and cotton industries require high humidity 【17】their products，and perishables such as fruits must be stored in cool，dry rooms．Some electronic components，drugs，and chemicals must be manufactured【18】the air is as free as possible 【19】dust and other particles．Air conditioning is【20】in hospitals，especially in operating rooms．
【20】
选项 A、virtual
B、viable
C、vibrant
D、vital
答案D
解析 考查上下文语义及形容词辨析。空格处所在句意为：空调对医院也 ________，特别是手术室。vital“极为重要的：关系重大的”，符合题意，为正确答案。virtual“实际上的；事实上的”，viable“可行的；可实施的”，vibrant“振动的；(色彩、光线)鲜明的，明快的；活泼的；生机勃勃的”，均不符合题意。
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