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题型：单选题题类：模拟题难易度：普通

Which of the following means “can be recycled"?

A、

B、

C、

D、

举一反三

_______ is an unhealthy life style.

Which of the following signs can be seen on the door of a shopping mall?

Which of the following signs can you often see next to a lake?

If H₂ burn in O₂, we can get ___________.

下列字母中一笔写成的是 ____。

CD 的汉语含义是。

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