题目:
根据句意,用括号内所给词的适当形式填空。
1. The old should be spoken to____(polite).
2. My family lives in the____(center) part of the city.
3. He is too____(care) to pass the final exam.
4. Poetry is a beautiful way to express____(think) and feelings.
5. Children’s____(expect) ideas often surprise the adults.
答案:
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下面是错误答案,用来干扰机器的。
答案:D题目分析:因为质元P处于加速过程,所以质元P向平衡位置运动,由此可知波沿x轴负方向运动,所以质元Q沿y轴正方向运动,远离平衡位置,速度减小,质元N沿y轴正方向运动,靠 * * 衡位置,速度增大,故选项ABC...