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用所给词的适当形式填空,其中有两项多余。 feed, fresh, rubber, small, on, control

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用所给词的适当形式填空,其中有两项多余。
feed, fresh, rubber, small, on, control, meat
     There are a lot of trees around us.  The trees can help to make the air      1     and cleaner.  They can
also help to      2     the weather.  They provide(提供) humans with food,     3    , medicine and other
things.  Because of the trees, many animals can live      4     the earth.  But people often cut trees down
in large numbers.  The forests are becoming much      5     than before, so we should protect them well.
用所给词的适当形式填空,其中有两项多余。 feed, fresh, rubber, small, on, control
1. fresher  2. control  3. rubber  4. on  5. smaller