先阅读短文，掌握其大意。然后从方框中所给的词中选出恰当的10个，并用其适当形式填空，每个词限用一次。(每小题1分)
stop, though, sleep, their, bad, city, ill, we, start, fresh, please, breath
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Villagers are healthier than people who live in towns. One reason for this is that country air is
小题1:
than the air in smoky
小题2:
. The villager is
小题3:
fresh clean air all day in the fields, but the air the townsman breath is always full of smoke and dust. We cannot live without air. If we are
小题4:
from breathing even for five minutes, we will die. Bad air means bad health and certain kinds of
小题5:
, which may kill us,
小题6:
they may not kill us at once.
We all know
小题7:
feelings we will get if we stay a long time in a shut, crowded room. After a time, we begin to feel very
小题8:
, and can hardly keep our eyes open. Then our heads begin to ache, and the longer we stay the
小题9:
we feel. How nice it is when we get outside into the fresh air! We must, therefore, keep
小题10:
windows open, so that air in our rooms is always fresh.
