The air in Beijing is getting much ________ now than a few years ago．

[　　]

A．clean

B．cleaner

C．cleanest

D．the cleanest

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科目：初中英語 來源： 題型：

The air in Beijing is getting much ______ now than a few years ago.
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科目：初中英語 來源： 題型：

If there are         trees, the air in our city will be         cleaner.
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先閱讀短文，掌握其大意。然后從方框中所給的詞中選出恰當(dāng)?shù)?0個，并用其適當(dāng)形式填空，每個詞限用一次。(每小題1分)

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Now the air in our city is _______ than it used to be. Something must be done to stop it.

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If there are ____trees, the air in our city will be ____cleaner.

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