问题 选择题

关于汽油、甘油和花生油的叙述正确的是 

A.都属于油脂

B.都无固定的沸点

C.都能浮在水面上

D.只有花生油能与氢氧化钠溶液反应

答案

答案:D

题目分析:汽油属于矿物油,化学成份是烃的混合物;甘油是丙三醇,是纯净物,有固定沸点,与水互溶;花生油是油脂无固定的沸点;三得的密度都小于水,且在水中不溶在水中都能浮在水面上;D中只有花生油能与氢氧化钠溶液反应实质是发生了酯的水解反应,正确;

阅读理解

Everyone has worries. How do you deal your worries? There is always something you can do to help yourself feel less worried. Sitting there worrying is no fun and it won’t solve your problems.

Grades at school are often a top worry for children. If you worry most about grades, ask yourself these questions:

● Why are grades important? What do grades mean to me?

● How do I get ready for class? Do I go over my notes even when there isn't a test?

● Do I have a good place to do my homework?

● Have I tried different ways of studying?

If your worry is about a fight you had with your friend, you might write down all the things you could do ---- write a note to him or her, invite him or her to watch a basketball game, say sorry to him or her and so on. Once you have a list of things you could do, you can choose one thing that could get your friend back.

You can ask for help when you're worried. You can find someone to talk to, such as your parents, friends, and teachers.

小题1:What do children often worry most about?

A.Their hobbies.

B.Their homework.

C.Their grades at school.

D.A fight with their friends.小题2:According to the passage, when you're worried, you’d better________.

A.work hard

B.ask for help and talk to someone

C.get ready for class

D.do your homework小题3:If you're worried about grades, Don't ask yourself  “___________”.

A.Why are grades important?

B.What do grades mean to me?

C.How do I get ready for class?

D.Why not give up my studies?小题4:If you had a fight with a friend, you could____________.

A.invite him or her to watch a game

B.put the blame on him or her

C.try to make new friends

D.leave him or her alone小题5:What does the passage mainly tell us?

A.Who is often worried.

B.When people are worried.

C.How to deal with worries.

D.What kinds of worries people have.

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