careful when you cross the road. A. Do B. Do be C. Is D. Are 题目和参考答案——青夏教育精英家教网—

题目内容

________careful when you cross the road.

A. Do　　 B. Do be　 C. Is　　　 D. Are

助动词do接动词原形表示强调语气。

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相关题目

The surprising experiment I am about to describe proves that air is all around you and that it proves down upon you. Air pressure is a wonderful force. When you swim underwater, you can feel water push down your body. The air all around you does the same. However, your body is so used to it that you do not notice this. The pressure is caused by a layer of air called the atmosphere. This layer surrounds the Earth, extending to about five kilometers above the Earth’s surface.

The following experiment is an easy one that you can do at home. But make sure that you are supervised, because you will need to use matches. Now foe the experiment！

What you need

·A hard-boiled egg without the shell

·A bottle with a neck slightly smaller than the egg

·A piece of paper

·A match

Metheod

1） Check that the paper will sit firmly on the neck of the bottle.

2） Tear the paper into strips and put the strips into the bottle.

3） Light the paper by dropping a burning match into the bottle.

4） Quickly sit the egg on the neck of the bottle.

Result

Astonishingly, the egg will be sucked into the bottle. Your friends will be amazed when you show them the experiment. But be careful when you handle matches.

Why it happened

As the paper burns, it needs oxygen and uses up the oxygen （air） in the bottle. The egg acts as a seal in the neck of the bottle, so no more air can get inside. This reduces the air pressure inside the bottle. The air pressure must equalize, so more air from outside must enter the bottle. The outside air pressure against the egg and then the egg is pushed into the bottle! The proves that air is all around and that it is pressing down on it.

64．Why is there the need to take care when you are doing the experiment?

A．The bottle could break.

B．You need to light the paper with a match.

C．The egg needs to be shelled.

D．The egg has to be perfectly placed on the neck of the bottle.

65．In the experiment, the burning inside the bottle can___.

A．equalize the air pressure inside and outside

B．make a seal in the neck of the bottle

C．finish up the oxygen inside the bottle

D．produce more oxygen inside the bottle

66．How did the egg put into the bottle？

A．The oxygen inside the bottle sucked the egg in.

B．It became salt without the shell.

C．The neck of the bottle was wide enough.

D．The outside air pressure forced it into the bottle.

67．The experiment is carried cut to prove ______.

A．water pushes on your body when you swim underwater.

B．the earth is surrounded by a layer of air called the atmosphere.

C．the pressure of air around us has a powerful force.

D．the air pressure is not equalized around us.

Dear editor,
Mary is my friend and she is a very good-hearted girl. She’s always the first to help out others. But her habits make me mad sometimes and she just won’t change her ways. For most situations, that’s just fine with me, as I know it’s what make her who she is. However, sometimes it’s just so hard for me to bear her behavior. She has recently got a cellphone, but she often borrows mine to make calls. My phone has a chain with it. She always tries to open it like her own phone. I usually open it for her, but not always, as sometimes I’m driving my car, so she needs to get it out of my purse and open it herself.
This weekend we were at a party in a faraway village. She borrowed my cellphone. As it was cold outside, I let her take it outside without opening it. Now it’s broken because she didn’t open it properly. I wouldn’t be so mad, but over the weekend she also borrowed my car and never offered to pay for the gas, which made me very angry. She should have offered to pay for the gas. As I have mentioned, she’s the type to help out others when and where she can. Perhaps because of that, she thinks others should also do the same for her. Sometimes I just think she is very childish. I don’t want to hurt her, but I do want to let her know that not everyone can accept that. What should I do to let her know that?
Yours,
Lily
【小题1】What is Lily’s purpose in writing this letter?

A．to advise us to be careful when making friends.

B．To tell others what kind of person Mary is.

C．To tell Mary what she thinks of her.

D．To ask for advice from an editor.

【小题2】We can learn from Paragraph 1 that _____.

A．Mary doesn’t have a cellphone

B．Mary doesn’t have any good habits

C．Lily is sometimes not pleased with Mary’s behavior

D．Lily has asked Mary to change her ways.

【小题3】What happened at the weekend party?

A．Mary lost Lily’s chain.

B．Mary left before the party was over.

C．Lily’s cellphone was broken.

D．Lily had a quarrel with Mary.

【小题4】What kind of person is Mary?

A．Friendly and beautiful.

B．Kind and careful.

C．Careful and childish.

D．Warm-hearted but childish

The surprising experiment I am about to describe proves that air is all aroud you and that it proves down upon you．Air pressure is a wonderful force．When you swim underwater, you can feel water push down your body．The air all around you does the same．However, your body is so used to it that you do not notice this ．The pressure is caused by a layer of air called the atmosphere．This layer surrounds the Earth , extending to about five kilometers above the Earth’s surface．
The following experiment is an easy one that you can do at home．But make sure that you are supervised , because you will need to use matches．Now for the experiment！
What you need
·A hard-boiled egg without the shell
·A bottle with a neck slightly smaller than the egg
·A piece of paper
·A match
Metheod
1) Check that the egg will sit firmly on the neck of the bottle．
2) Tear the paper into strips and put the strips into the bottle．
3) Light the paper by dropping a burning match into the bottle．
4) Quickly sit the egg on the neck of the bottle．
Result
Astonishingly,the egg will be sucked into the bottle．Your friends will be amazed when you show them the experiment．But be careful when you handle matches．
Why it happened
As the paper burns,it needs oxyen and uses up the oxygen(air) in the bottle．The egg acts as a seal in the neck of the bottle,so no more air can get inside ．This reduces the air pressure inside the bottle．The air pressure must equalize,so more air from outside must enter the bottle．The outside air pressure against the egg and then the egg is pushed into the bottle!The proves that air is all around and that it is pressing down on it．
53．When you do the experiment, why need you a person beside you?
A．You couldn’t place the egg on the bottle by yourself．
B．The egg needs to be shelled．
C．You need to use matches．
D．The bottle can’t sit firmly on the desk．
54．The purpose of doing this experiment is to prove ______．
A．air pressure is a wonderful force
B．water can push down your body when you swim underwater
C．the air pressure is not equalized around us
D．the earth is surrounded by a layer of air called the atmosphere
55．How did the egg put into the bottle？
A．The oxygen inside the bottle suckde the egg in．
B．It became solt without the shell．
C．The neck of the bottle was wide enough．
D．The outside air pressure forced it into the bottle．
56．The passage is ______．
A．an experiment report B．a scientific story
C．a research report D．an interesting novel

My friend Karen and I were always together. Karen was only a few months older than I. I always thought she was so beautiful, with long hair and blue eyes. I loved Karen so much because she liked me for being the way I was. I could be myself and share my secrets with her and I never felt like I was being judged.
We had so much fun and were really quite silly. One time I asked my mom to make us the same dresses so we could pretend we were twins.
We continued as best friends throughout grade school. One day, Karen was going to another friend’s place and asked me to come along, but I couldn’t go because I had a babysitting job that afternoon. We walked together to the Becker’s home where I was to babysit and then she continued on her way without me. We had agreed that I would meet her at the corner when she returned and I finished my job.
At four o’clock I rushed to the corner so I wouldn’t be late for meeting Karen. Just as I arrived at the corner, I saw Karen crossing the street. In a second it happened. I saw Karen’s body fly up in the sky. A car had hit her！
Karen was on life support for a week before it was decided that they would allow her to go in peace. Karen’s parents wanted to donate her organs(器官)to the hospital, but there was nothing left healthy enough to be used because she was hit so hard.
I have never got so close to another person since Karen died. I do miss her! Do you cherish(珍惜)your friends? If you don’t, please do, as you may lose them one day.
【小题1】What’s the best title for the passage?

A．A horrible car accident

B．An unforgettable experience

C．My dearest friend—Karen

D．An unforgettable girl

【小题2】When Karen was hit by a car, she was .

A．on her way to a friend’s place

B．on her way to the Becker’s home

C．shouting to the writer who was so far from her

D．heading to the corner where she and the writer would meet

【小题3】Why were Karen’s organs unable to be donated?

A．Because her parents refused to do that.

B．Because all of her organs were seriously damaged.