题干

一列简谐波向右传播,沿波的传播方向上有相隔一定距离的PQ两点,当P点经过平衡位置时,Q点也恰好经过平衡位置,如图所示,已知PQ间只有一个波峰,试画出PQ间可能的波形。

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答案(点此获取答案解析)

解:当P点经过平衡位置时,Q点也恰好经过平衡位置,通过画出几个波形的草图可以知道,本题目结果具有多解性,具体如下:

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完形填空

    One year my children came home from school asking where we were going on your summer vacation. It seemed that all the other kids were1 where they were spending the summer. I couldn't 2to take them anywhere but I didn't want to tell them that so I just said, “It's a surprise!” They were 3. That bought me a little more 4.

    I called several amusement 5to see if there was a half-price event during the summer but no such 6. I tried everything, with no success, so I called some of the other moms to find that most were in the same7that I was. We decided to8 something fun for our kids to do. We had a meeting, all five of us, and9 what is now called a “playcation”.

    One mother was a  10, so on Mondays the kids would all go to her house. They would play games using plants and11. They also planted vegetables and12 them grow over the summer.

    Another mother had Bible 13 on Tuesdays. She asked some questions about Bible. The kid who answered  14got a penny, which they all turned in at the end to buy their goodie bags(礼品袋).

    At our house on Wednesdays, I made an outdoor 15training with my spare tires. The kids also walked a balance beam and raced through large cardboard boxes taped together.

    On 16they had arts and crafts across the street. Fridays were17by a wonderful single dad with a metal detector(金属探测器)who took everyone out treasure18 .

    The summer was a big19 . Okay, it wasn't Disney World,20 the kids didn't miss anything. My son actually asked me, “Can we do this again next year?”