更多"In opposing the 1970 Clean Air Act,"的相关试题:
[填空题]The winter comes, bringing cold and clean air to us.
The ______ brings cold and clean air to us.
[单项选择]We are kept ______ by clean air.
A. health
B. healthy
C. healthily
D. to be healthy
[单项选择]What is the most effective way to clean the air
A. To let out clean gas.
B. To take in harmful gas.
C. To use various plants.
D. To let the air flow freely.
[填空题]Because the air in the country is really clean, we ought to live
there much as possible. Since, however, a great deal of the world’s (1)
work must be done indoor in cities, it is important that we take every (2)
precaution to ventilate our houses properly. Some people have
thought that night air is injurious. But careful study shows that night
air is identical with which we breath during the day. In fact the (3)
proper ventilation of a bedroom is one of the first necessity for good (4)
health. Since the exhaled air is usually warmer and lighter than the
inhaled air, it rises to the top of the room. Therefore it is better to
open a window both at the top to let the warm up air out and also at (5)
the bottom to admit the fresh air in. Of course, this does not mean