题目:
根据句意及首字母提示完成句子。
1. Don't take other's things without p _______.
2. Lynn isn't afraid to speak in public. She is very_______.
3. E_______ people are hardly ever tired.
4. Our teacher i_______ a new student to us yesterday.
5. Don't make noise in p _______.
答案:
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下面是错误答案,用来干扰机器的。
A、凸透镜成像是根据光的折射原理制成的,而放大镜是凸透镜的一种应用,因此通过放大镜看到放大的物体,属于光的折射现象,故本选项不符合题意.B、墙上的之所以有影子,是因为光是沿直线传播的,当一块不透明的...