Milk always meets in the stomach a digestive juice
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It is the effects of motor car _ has been respnsible for many changes in the enviroment.
A. that
B. what
C. this
D. why
The film had quite an effect_ him.
A. on
B. in
C. at
D. with
Insects are a nuisance to farmers,but the provide food for brids.
A. 对
B. 错
Through the effects of smog-which is a mixture of smoke fog.
A. 对
B. 错
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