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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．
【8】
选项 A、quality
B、sum
C、amount
D、number
答案C
解析 考查名词辨析。quality意为“质量”；sum意为“总计，总和”；amount一般用于不可数名词，如：a substantial amount of money；number一般仅仅用于可数名词，如：a large number of  mistakes。根据语境可知，此处修饰的是不可数名词，表示的是“数量”故amount为正确答案。
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