问题 问答题

蒙蒙同学学习了给液体加热的实验后,想试着做给固体加热的实验。她用一支试管装入蓝色硫酸铜晶体,用试管夹夹住并放在酒精灯上加热,一会儿后,发现试管炸裂。请你与她一起探究造成试管炸裂的可能原因有哪些?

答案

(1)试管管口向上倾斜

(2)加热前没有预热

(3)试管外壁不干燥

(4)试管底部接触灯芯

阅读理解

阅读短文,根据其内容回答问题。

These days, many Chinese people are happy about a piece of news. What is it? China may become the second largest economy (经济体) in the world. It’s only behind the US.

But is China the second richest country, too?

No. The economy is like a cake. The US, Japan and China each makes one. China makes the second biggest cake. But lots of people have to eat it. Why? There are 1.3 billion people in China. And there are only 300 million people in the US and 127 million in Japan. So, in China, each person only gets a very, very small piece of cake. But people in the US and Japan have bigger pieces.

China is not as rich as the US and Japan. For example, in the US, in every 100 people, 75 can surf the Internet; in Japan it is 74 in 100. But in China, only 26 people in 100 use the Internet.

China’s large economy brings good things. People in China have more jobs and money. We also have more influence (影响) in the world.

小题1:China is the second largest economy in the world, isn’t it?

                                                     

小题2:Why isn’t China as rich as the US and Japan?

                                                     

小题3:How many people in 100 can use the Internet in China?

                                                     

小题4:Who can get bigger pieces of cake, Chinese or Americans?

                                                      

小题5:China’s large economy brings good things. What are they?

                                                      

单项选择题 A1/A2型题