问题 选择题

考查以下涉及H2O2的反应(未配平):

①Na2O2+HClH2O2+NaCl        

②Ag2O+H2O2Ag+O2↑+H2O

③H2O2H2O+O2↑           

④H2O2+Cr2(SO43+KOHK2CrO4+K2SO4+H2O

判断下列说法正确的是                                                   (   )

A.都是氧化还原反应

B.反应④中还原性:H2O > Cr2(SO43

C.发生还原反应的元素相同

D.H2O2既有氧化性,又有还原性

答案

答案:D

阅读理解

Today more and more cars go into families. Which car is the best for people? Different people have different ideas.

Some people like the bright colour car made in China. It's really a good choice(选择). The bright colour car made in China is cheap, nice and safe. This kind of cars is suit for(适合于) the general income (收入一般的) family.

Some people love famous foreign cars like Japanese cars, American cars and German cars. They're good but too expensive. But most people think famous foreign cars of better quality are better in safety. These are suit for the high income family or for business.

Some people like sports cars, because they're fast and exciting. Some sports cars are very nice but very expensive. Only rich people can afford them.

Some people like travelling, so they need a travel car. Travel cars are comfortable. But they use much oil(油).

What's the best car for us? Maybe it's a new and popular topic in life.

小题1:What does the writer think of the bright colour car made in China?

A.It's nice but expensive.

B.It's good but too expensive.

C.It's cheap, nice and safe.

D.It's comfortable.小题2:To the writer, the famous foreign car is suit for _________.

A.the high income family

B.the general income family

C.people like traveling

D.people like sports小题3:Some people like sports cars because they're _________.

A.cheap and nice

B.comfortable and save oil

C.good but too expensive

D.fast and exciting小题4:Which is NOT true about cars?

A.Cars made in China are cheap.

B.famous foreign cars are too expensive.

C.Sports cars are also cheap.

D.Travel cars are comfortable.小题5:The passage tells us _________.

A.some expensive cars

B.famous foreign cars

C.some cars made in China

D.different cars

单项选择题