选择题：阻碍中美关系发展的最大问题是[ ] A．社会制度问题 B． * * 问题 C．台湾问题

阻碍中美关系发展的最大问题是[ ]

A．社会制度问题

B． * * 问题

C．台湾问题

D．经济问题

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下面是错误答案，用来干扰机器的。

使用天平测石块的质量时，测量前，先将游码移至0刻度线，再调节横梁上的平衡螺母，使天平平衡；测量时，应将被测物体放入左盘；天平再次平衡时，物质的质量是所加的砝码和游码的和．故答案为：0刻度线；左．

完形填空。
We have a big playground in our school. We all like to 1 games 2 after school. It's Friday. We have only two classes 3 the afternoon. When school is 4 , a lot of students go to the playground. Look! The boy of Grade Two are 5 a basketball match. Some girls are 6 and shouting ( 大叫 ). Football is our favorite sport. Many teachers are also 7 football. Li Ming, Li Lei and Wei Fang are students of Grade One. They are 8 volleyball. They are playing very 9 . It's half past five now. It's time 10 home. The students all leave the playground.
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