Question

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．a(chǎn)ir 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．a(chǎn)n experiment report            B．a(chǎn) scientific story

     C．a(chǎn) research report                  D．a(chǎn)n interesting novel

Answer 1

53-56 CADA

解析:

53．C 細節(jié)理解題。由第二段的But make sure that you are supervised , because you will need to use matches．可知。

54．A 考查寫作目的。根據(jù)文章第一句和最后一句推理歸納。

55．D 本題是判斷推理題。根據(jù)文章倒數(shù)第二句The outside air pressure against the egg and then the egg is pushed into the bottle!可知。

56．A 屬于文體判斷題。從全文來看，包括實驗所需的材料、方法、結(jié)論與原因，這是典型的實驗報告。