5．
阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
Now I am talking about fighting for our environment. the environment doesn't have a mouth to say what humans have
done to her, she fights back. In the early years people cut down large number of trees at the source of the Yellow River, which
(lead) to terrible floods
and the disappearance of big forests. As a result, the Loess Plateau which was
once (cover) with grass and
forests was turned into barrens (荒地). Another example is in several developed (country). Some chemical factories gave off so much (harm) gas that some people were killed by the air they
had breathed in.
we
are suffering(遭受) is only a small part of what nature once suffered. If we don't
take action (show) care for the environment,
we will have to face an increasingly awful situation.
Only by changing the way we treat the environment can we
get along well it. Only by saving the
environment can we save .
