题目内容

It is _________ for us to do some exercise every day.

A. benefit
B. benefited
C. beneficial
D. benefiting

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As demand for ________foods has grown, many farmers would not use pesticide any more.

A. chemical-free
B. pesticide-free
C. antioxidant
D. duty-free

We can ______ a lot ________ doing exercises every day.

A. benefit... with
B. benefit...on
C. benefit...from
D. benefit...into

There are many __________in organic foods.

A. benefit
B. beneficial
C. benefiting
D. benefits

Conditions_____ farm to farm, so the experiment results are not reliable.

A. vary from
B. change
C. differ
D. varies from

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