A、
They are rare species.
B、
They protect the environment.
C、
They pollinate crops and wild plants.
D、
They protect crops and wild plants.
【正确答案】
C
【答案解析】
A、
Chemicals should be used as many as possible.
B、
Chemicals should be used only if necessary.
C、
Chemicals should be used as few as possible.
D、
Chemicals should be used once a month.
【正确答案】
B
【答案解析】
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