题目:
用所给词的正确形式填空。
1.Today is her _______(eight) birthday.
2. This is _______(I) mother.
3. Let’s _______(watch) TV.
4. That _______(sound) good.
5. Do you _______(like) basketball?
6. I have a pair of _______(sock).
7. Henry _______(have) a penfriend.
8. These are my _______(photo).
9.September is the _______(nine) month of the year.
10. There _______(be) a baseball and some books on the desk.
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:当磁场分布在以O为圆心的一个圆形区域内,由于半径不知,所以当P点在磁场之外,则粒子从O点沿x轴正方向,因此出磁场时,还没有到达P点,接着做匀速直线运动后到达P点时,所以经过P点的速度方向...