问题 选择题

有关锌锰电池和碱性锌锰电池的比较中,不正确的是(    )

A.电解质溶液不同,前者为NH4Cl,后者为KOH

B.两电池负极均为锌,且均为锌失电子发生了氧化反应

C.两电池正极材料均为MnO2,且正极均为MnO2得电子发生了还原反应

D.两电池均为一次电池

答案

C

锌锰电池的正极反应为:2NH4++2e-2NH3↑+H2

碱性锌锰电池的正极反应为:2MnO2+2e-+H2OMn2O3+2OH-,故C项错误。

阅读理解

Lots of kids hate school, a new study found. Usually this kind of feeling doesn't last long. But what happens if you feel this way too much? School is a fact of life and getting a good education can help you build the kind of future life you want. So let's talk about school and what to do when you don't like it.

If you don't like school, the first step is to find out why. You might not like school because you don't have enough friends, or maybe you don't get along with your teacher. Sometime it's a big problem with your classes and school-work. You may be getting farther and farther behind,and it may seem like you'II never catch up.

When you know why you don't like school, you can start taking steps to make things better. It's a good idea to talk to someone about your problems with school. Your mum, dad, teacher or school counselor(顾问) will be able to help you. Another good idea is to write down your feelings about school in a notebook. It's a great way to let out emotions(情绪). Remember, you don't have to share what you've written with others.

小题1:Lots of kids        , according to the writer.

A.like school very much

B.are good at reading and writing

C.don't like doing homework

D.have the thought of hating school小题2:What does the underlined word “it”refer to(指的是)in the frrst paragraph?

A.A good education.

B.School.

C.Future life.

D.Friendship.小题3:If you don't like school, the first step is to.

A.find out why

B.go to see a doctor

C.ask your parents for help

D.leave school for a short time小题4:How many reasons why you don't like school are given by the writer?

A.Two.

B.Three.

C.Four.

D.Five.小题5:When you start taking steps to make things better, one of the good ideas is to       .

A.keep silent about your problems

B.share what you' ve written with others

C.write down your feelings about school

D.get along well with your classmates

选择题