问题 单项选择题 A1/A2型题

测量DNA分子浓度的光的波长是()。

A.245nm

B.255nm

C.260nm

D.275nm

E.290nm

答案

参考答案:C

解析:DNA在260nm有光吸收。

阅读理解

Cars are an important part of life in the United States. Without cars most people feel that they are poor. And even though a person is poor, he doesn't really feel poor when he has a car.

Perhaps(可能) you have heard of Henry Ford. He first started making cars in large numbers. Perhaps he didn't know how much the car was going to be to American culture(文化). The car made the United States a nation on wheels(车轮). And it helped make the United States what it is now.

The car has become popular in the United States. The Americans like to move around in cars. With a car people can go to any place without spending a lot of money.

小题1:In the United States ____.

A.only rich people have cars

B.no poor people have cars

C.most people have cars

D.only a few people have beautiful cars小题2:Who was Henry Ford? ____.

A.He was one of the famous car makers

B.He was the most popular man in the USA

C.He was the richest man in the USA

D.He was the first car maker in American history小题3:Henry Ford started making cars in large numbers because ____.

A.he wanted to change the American culture

B.he knew cars would be make only in the United States

C.he thought Americans would like his cars best

D.he knew more and more people would buy cars小题4:Which of the following do you think is true? ____.

A. There are too many people everywhere in the USA.  

B. There are a lot of cars everywhere in the USA . 

C. Car pollution(污染) is the biggest problem in the USA.  

D. Every family more or less has a car.

小题5:We can know from this passage(文章) that ____.

A.cars are cheaper in the USA

B.the Americans are the richest in the world

C.the Americans like to move around in cars

D.the USA makes the most cars

单项选择题