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When we finish the session, you'll_______________.

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So, in Mexico, for example, they use_______ in hospitals. A group of people go around the hospital, visiting the patients, and basically,_, by telling them jokes, or_________.

Absolutely! They feel better, and_______________.

根据金属的颜色和成分，铜及铜合金可分为（）

A. 纯铜
B. 黄铜
C. 青铜
D. 白铜

白铜是铜和（）的合金

A. 锌
B. 镍
C. 铝
D. 锡