He made _____ experiments to prove his theory...

He made _____ experiments to prove his theory, and the number _____ added up to 600.

A．a large number of ;have                  B．a great deal of; has  C．a great many; has D．plenty of; have

高二英语单项填空中等难度题查看答案及解析

The surprising experiment I am about to describe proves that air is all around you and that it presses down upon you. Air pressure is a powerful force. When you swim underwater, you can feel water pushing on 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 (层) 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 (监督), because you will need to use matches. Now for the experiment.

What you need

● hard-boiled egg without the shell

● A bottle with a neck slightly smaller than the egg

● A piece of paper

● A match

Method

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

2) Tear the paper into pieces and put them 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 scale 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 presses against the egg, and then the egg is pushed into the bottle! This proves that air is all around and that it is pressing down on us.

1.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 (脱壳).

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

2. How did the egg get into the bottle?

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

B. It became soft without the shell.

C. The neck of the bottle was wide enough.

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

3.The experiment is carried out 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

高二英语阅读理解中等难度题查看答案及解析

I’m glad to see the sea air has 　　 to his health and he is at work now.

A.made a move B.made a difference

C.took a step D.took a walk

高二英语单项填空中等难度题查看答案及解析

To his disappointment, the opinion he tried to stick __________ wrong.

A. to prove　　　　　　 B. to proving　　　　 C. to was proved　　　　　 D. to proved

高二英语单项填空困难题查看答案及解析

The theory he sticks to _______ to be of no use in his new work ______ he finds it hard to fit in.

A. is proved; where B. proves; with which

C. proving; to which D. prove; how

高二英语单项填空困难题查看答案及解析

The theory most scientists objected to         in the end .

A. being proved to be of significance    B. was proved to be significance

C. proving to be significant            D. proved to be significant

高二英语单项填空简单题查看答案及解析

Greedy  _______ the opportunity to prove his ability, he took up the without any hesitation.

A. with     B. about    C for       D. of

高二英语单项填空简单题查看答案及解析

The theory _____ by Einstein was later to prove true, but at that time few people could accept it .

A. put out   B. put together    C. put aside     D. put forward

高二英语单项填空中等难度题查看答案及解析

_______as a great discoverer, he has made a good number of experiments on the mice.

A.To honor B.To be honored C.Honoring D.Having honored

高二英语单项填空中等难度题查看答案及解析

_______ greatly by what he had heard and seen, he made up his mind to stand on his own feet again.

A．Inspiring          B．To be inspired      C．Being inspired      D．Inspired

高二英语单项填空中等难度题查看答案及解析