题目内容

If something is _____________, it is usual and not very special.

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When you ______________ people, you make sure they have everything they need.

When you ______________ something, you make it.

苔藓虫喜欢在较清洁、富含藻类、溶解氧充分的水体中生活。

A. 对
B. 错

在污染水体中水蚤颜色比在清水中的红些。

A. 对
B. 错