判断题

Insecticides not only eliminate pests, but also kill many other insects, thus affecting the sensitive ecological balance, and gradually poisoning other organisms, such as birds that feed on insects.

答案：正确

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多项选择题

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B、个人版
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D、企业版

单项选择题

I wish to thank Professor Smith, without help I would never have got this far. A.

who B.

whose C.

whom D.

which