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问题 选择题

．如图一束光线从空气斜射入水中，在界面发生反射和折射时（   ）

A．反射角等于30°

B．折射角大于反射角

C．折射角等于反射角

D．以上说法不对

答案

答案：D

入射角为60°，反射角等于60°，A错误；折射角小于反射角；BC错误；故选D

完形填空

根据短文内容和首字母提示，在空格处填入适当的词使短文完整。（每空一词）

One day Mother looks at Simon's shoes and says, “L  小题1:   at your shoes. They are very dirty（脏）. You must c 小题2:   them.” “ But I cleaned them yesterday,” says the boy. “They are dirty now. You m  小题3:   clean them now.” “I don't want to clean them t  小题4:   . If I clean the pair of shoes today, t  小题5:   will still be dirty tomorrow.” “All right. D  小题6:   do it then.” Simon's mother says.

In the evening, he is very h  小题7:   . He asks his mother to give him s  小题8:   to eat. “You had breakfast in the morning, Simon, and you had l  小题9:   at school.” His mother says. “But I’m hungry a  小题10:   .” “But if I give you something to eat today, you will be hungry again tomorrow.”
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单项选择题

村委会选举制度实现了（）的统一。

A、物质文明和精神文明

B、经济和政治

C、发展和稳定

D、稳定和活力
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