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问题 单项选择题

下列哪组有机磷农药在肝脏氧化后毒性反而增强（）

A.甲拌磷、甲胺磷

B.甲基对硫磷、马拉硫磷

C.对硫磷、内吸磷、敌百虫

D.氧乐果、乐果

E.乙硫磷、敌敌畏

答案

参考答案：C

选择题

She returned home , ______ the feathers_____ her chicken by the terrible tornado.

A．found; taken off

B．finding; had been taken off

C．to find; were taken away

D．finding; has been taken off
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单项选择题

货币市场基金可以投资于剩余期限小于397天但剩余存续期限超过（）天的浮动利率债券。

A.360

B.360

C.397

D.425
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