更多"Because the air in the country is r"的相关试题:
[填空题]Because the air in the country is really dean, 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 that we breathe 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 (6) ______
that one should sleep in a strong draft. In many places it is feasible to
sleep out-of-the-doors on
[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
