One reason human beings can thrive in all kinds of climates is that they c

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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 the air in the enclosed spaces in which they live. Air conditioning is the use of mechanical systems to 【C1】______  that control in such places 【C2】______  homes, offices, theaters, institutions, factories, airplanes, and automobiles. The most familiar type of air conditioning is summertime cooling., Although important, this is 【C3】______  one of several aspects of air conditioning. Other applications 【C4】______  the control of the humidity (or air moisture), cleanliness, circulation of the air, and heating.
   Tests have 【C5】______  that people generally feel best 【C6】______  certain temperature, humidity, and air velocity conditions. Temperatures can 【C7】______  from 21.5°C with 70 percent relative humidity to 28°C with 30 percent relative humidity. Relative humidity is the 【C8】______ of moisture in the air 【C9】______  a specific temperature compared 【C10】______  the amount it could hold at that temperature. 【C11】______  air velocities range from 4.5 to 10.5 meters per minute. It is also desirable that an air conditioner 【C12】______  dust, pollen, smoke, and odors from the air.
   In many industrial environments, air conditioning is essential. Most print shops, for example, 【C13】______ . constant humidity in order to control paper shrinkage and 【C14】______  the 【C15】______  operation in some processes. Libraries, especially ones With rare books, require air control to 【C16】______  the physical quality of their collections. Bakeries and the tobacco and cotton industries require high humidity 【C17】______  their products, and perishables such as fruits must be stored in cool, dry rooms. Some electronic components, drugs, and chemicals must be manufactured 【C18】______  the air is as free as possible 【C19】______  dust and other particles. Air conditioning is 【C20】______  in hospitals, especially in operating rooms. [br] 【C11】

选项 A、Agreeable
B、Appreciable
C、Amenable
D、Available

答案 A

解析题型：词汇题。Agreeable air velocities range from 4.5 to 10.5 meters per minute．最舒适的空气流动速度在每分钟4.5米到10.5米之间。agreeable adj.使人愉快的，惬意的，适合的。例如：agreeable weather舒适的天气。B项appreciable adj.可感知的；值得重视的。C项amenable adj.应服从的，有服从义务的，有责任的。D项available adj.可用到的，可利用的，有空的。

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