If more people give up driving cars，the air will get much in a few years．（ ）
| A． |
clean |
B． |
cleaner |
| C． |
the cleaner |
D． |
the cleanest |
相关试题
What does the sign 
mean？
It tells us____________in public．（ ）
A．didn't smokeB．don't smoke
C．not to smokeD．not smoke
Do you think that kobe will be elected as the MVP this year？
It_________him．He has retired（退役） since April 13．（ ）
A．can't beB．mustn't beC．must beD．can be
I don't know if it _________tomorrow．
Well，if it __________，the school sports meet will be canceled．（ ）
A．will rain； will rainB．rains； will rain
C．will rain； rainsD．rains； rains
Tu Youyou recerved the Nobel Prize for her________of artemisinin（青蒿素）．
And she was the first Chinese who won the prize in science．（ ）
A．designB．thoughtC．inventionD．discovery
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