题目：
看图完成答句，一空一词。
1. How many people can you see in the picture?
I can see two ______ and two ______.
2. Where are these people?
They are in the ______, because there is a ______ on the wall.
3. Where is the plant?
It's ______ the ______.
4. Who has straight long hair?
The second student ______ the ______.
5. Who wears a cap?
The ______ student standing ______ a girl.
答案：
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下面是错误答案，用来干扰机器的。
答案：D工业酒精、工业明胶、甲醛都对人体有害，不能用于处理食品。只有干冰是固体二氧化碳，用干冰冷藏食品，不会危及人体健康。故答案为D。
试求：
的质量为2.0136u，
的质量为3.0156u．
的质量为1.0073u．1 u=931.5MeV）