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问题 单项选择题

机组氧气瓶内的氧气最大的特点是（）

A.无水分

B.纯净

C.压力大

答案

参考答案：A

判断题

Al-C水口烘烤时间在60～120分钟。
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填空题
用括号内所给单词的适当形式填空。
Fair, crowd, shake, light, science
1.  I  like soft______ because it can make people look good.
2.  Jim always gets good grades because he studies in the ______ way.
3.  It was______ that mom gave a new schoolbag to my brother, but I got nothing.
4.  The train station is quite______ before the Spring Festival.
5.  They ______hands and said "Goodbye" to each other.
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