题目内容

质点的速度等于该质点的位置矢量对时间的导数。

A. 对
B. 错

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Organic produce looks the same as regular produce.

A. 对
B. 错

Organic produce can cost twice as much as regular produce.

A. 对
B. 错

Farming chemicals kill insects, but they don’t kill fish and birds.

A. 对
B. 错

Many scientists believe that farming chemicals cause cancer.

A. 对
B. 错