问题 选择题

如图所示的四种现象或应用中,能用光的折射知识进行解释的是  (  )

A.插入水中的手指

B.手影游戏

C.潜望镜

D.自行车尾灯

答案

A、插入水中的手指变“粗”是光的折射形成的(放大镜原理),此选项符合题意;

B、手影游戏是光的直线传播形成的,此选项不符合题意;

C、潜望镜是利用了光的反射,此选项不符合题意;

D、自行车尾灯是利用光的反射,此选项不符合题意;

故选A.

阅读理解

阅读理解。

     In many western schools, sports day is a big event. Children take part in competitive (竞争性的)

sports, trying to break school records and take the first place.

     Sports days, or sports meets, are usually held in the warmer seasons, either at the beginning or the

end of the school year. They are also called field days.

     Primary school sports days are fun. They usually have activities such as the egg and the spoon race

and the sack race. Other events include the skipping race (跳绳) and the three-legged race. In middle

and high schools, sports days include many of the common track and field events (田径项目).  They

are more serious and competitive than primary school ones.

     Students' parents and other relatives also come to the  school on sports days. They watch children

play. Many schools in the West have "mothers and fathers" races for parents to take part in!

     Although sports days are exciting, they also have some problems. According to some reports in the

USA, sports days have become too competitive to be good for students. Some parents put too much

pressure(压力) on the children. Some schools don't have "mothers and fathers" races any more as there

is much fighting and cheating.

短读阅文,回答下列问题。

1. What do children try to do when they take part in sports meets?

___________________________________________________

2. When are sports days usually held in the school year?

___________________________________________________

3. What are primary school and middle school sports days like?

___________________________________________________

4. Who would come to the school to watch children play on sports days?

______________________________________________________

5. What does the writer think about sports days?

______________________________________________________

材料题