Read the following text.Choose the best word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1.( 10 points )
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 1 that control in such places 2 homes, offices, theaters, institutions, factories, airplanes, and automobiles. The most familiar type of air conditioning is summertime cooling. Although important, this is 3 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° C with 70 percent relative humidity to 28° C 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 15 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.
1. A. achieve B. avail C. amount to D. assign
2. A. like B. as C. for D. to
3. A. but B. like C. as to D. mere
4. A. include B. contain C. consist D. comprise
5. A. determined B. caused C. maintained D. achieved
6. A. at B. around C. within D. under
7. A. alter B. range C. differ D. move
8. A. qualityB. sum C. amount D. number
9. A. under B. inside C. on D. at
10. A. to B. with C. against D. at
11. A. Agreeable B. Appreciable C. Amenable D. Available
