问题 问答题

小红家有一焦距为50mm的照相机,她利用该相机做了如下实验:

(1)取下镜头,让太阳光正对镜头,可将太阳光会聚成一点,说明镜头相当于______.

(2)用该照相机镜头当作放大镜来观察地上的蚂蚁时,发现蚂蚁被放大了.此时镜头距蚂蚁的距离______(填“大于”、“等于”、“小于”)50mm.

答案

(1)照相机的镜头是一个凸透镜,对光线有会聚作用.所以让太阳光正对镜头,可将太阳光会聚成一点,这一点即为凸透镜的焦点.用这种方法可以测量此凸透镜的焦距.

故答案为:凸透镜.

(2)要将凸透镜做为放大镜使用,需使物体在1倍焦距之内,并且成放大、正立的虚像.

故答案为:小于.

完形填空

New York is one of the most exciting cities in the world.

You might want to do some shopping in New York. Fifth Avenue is probably New York's most famous shopping street, but if you go, be prepared to "window shop" only. This is shopping for the rich. There are other, less expensive shopping areas nearby, and you'll soon come across famous stores(商店) such as Bloomingdales, Macy's and FAO Schwartz.

And if you've brought your rollerblades(滚轴溜冰鞋), then a visit to Central Park is a must. This is a large,

open park right in the middle of Manhattan, but if you thought that people came here to relax, sit down for a few minutes and get away from the rush(忙碌) of New York life, then you'd be wrong. Nobody sits in Central Park: they run, jog , and most of all, they rollerblade.

When you leave New York, you might be tired, even poor and overweight, but the one thing you won't be is bored!

根据短文内容,回答问题。

小题1:Why would you probably only “window shop” in Fifth Avenue ?

                                                                           

小题2:There is a big park in Manhattan. What is the name of it ?(2 words)

                                                                          

小题3:What don’t people do in Central Park ?( less than 3 words)

                                                                           

小题4:Which street is New York’s most famous shopping street ?(2 words)

                                                                           

小题5:What do people usually do in Central Park ?(less than 5 words.)

                                                                           

单项选择题