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[主观题]

Because we can feel that things are heavy, we think of weight as being a fixed quality in

an object, but it is not really fixed at all. If you could take a one pound packet of butter 4,000 miles out from the earth, it would weigh only a quarter of a pound.

Why would things weigh only a quarter as much as they do at the surface of the earth if we took them 4,000 miles out into space？ The reason is this: All objects have a natural attraction for all other objects; this is called gravitational attraction, but this power of attraction between two objects gets weaker as they get farther apart. When the butter was at the surface of the earth, it was 4,000 miles from the center (in other words the radius[半径] of the earth is 4,000 miles). When we took the butter 4,000 miles out, it was 8,000 miles from the center, which is twice the distance.

If you double the distance between two objects, their gravitational attraction decreases (减少) two times two. If you treble (成三倍) the distance, it gets nine times weaker (three times three). If you take it four times as far away, it gets sixteen times weaker (four times four ) and so on.

The best title for this passage is______.

A．The Earth Weight

B．Weight in Space

C．Changing Weight on the Earth

D．Weight on and off the Earth

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发布时间：2020-11-10

更多“Because we can feel that things are heavy, we think of weight as being a fixed quality in”相关的问题

第1题

A. Because it can help us leam a language. B. Because it is something th

A. Because it can help us leam a language.

B. Because it is something that we all carry about with us.

C. Because it can record what we see, feel, and so on.

D. Because it can take real pictures of our experiences.

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第2题

We can feel things are heavy because ______.A．weight is a fixed quality in an objectB．they

We can feel things are heavy because ______.

A．weight is a fixed quality in an object

B．they are far away from the center of the earth

C．of the earth's strong attraction for them

D．they are not taken away from the surface of the earth

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第3题

We can feel things are heavy because ________.[A] weight is a fixed quality in an o

We can feel things are heavy because ________.

[A] weight is a fixed quality in an object

[B] they are far away from the centre of the earth

[C] of the earth’s strong attraction for them

[D] they are not taken away from the surface of the earth

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第4题

All of the following statements are correct EXCEPT that______.A．whether we like it or not,

All of the following statements are correct EXCEPT that______.

A．whether we like it or not, stress is a normal part in our lives

B．something stressful to one person may be nothing at all to another

C．stress is something that we can hardly control because it appears almost everywhere in our lives

D．whether stress causes problems or not mainly depends on how we feel about ourselves

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第5题

听力原文：We cannot feel speed. But our senses let us know that we are moving. We see thing

听力原文： We cannot feel speed. But our senses let us know that we are moving. We see things moving past us and feel that we are being shaken. We can feel acceleration, an increase in speed. But we notice it for only a short time. For instance, we feel it during the take-off run of an airplane. We feel the plane's acceleration, because our bodies do not gain speed as fast as the plane does. It seems that something is pushing us back against the seat. Actually, our bodies are trying to stay in the same place, while the plane is carrying us forward.

Soon the plane reaches a steady speed. Then, because there is no longer any change in the speed, the feeling of forward motion stops.

How do you explain that we are moving？

A．By watching things move past.

B．By feeling the speed.

C．By feeling ourselves being shaken.

D．Both A and C.

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第6题

What can we assume from the passage？A．Most people who feel they have been wronged have a r

What can we assume from the passage？

A．Most people who feel they have been wronged have a ready remedy in court of law.

B．Many people would like to bring a case to court,but are unable to because of time required.

C．The judicial system in the United States is highly acclaimed for its efficiency.

D．Pretrial conferences will someday probably have replaced trials completely.

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第7题

We can learn from the passage that______.A．failure has always been connected with negative

We can learn from the passage that______.

A．failure has always been connected with negative image of people in America

B．people tend to feel regret for their failure in career upon death nowadays

C．failure should be redefined because it may function as a reminder of people

D．people who failed should be blamed for their incompetence instead of fortune

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第8题

Making your way gloomily to the airport after an action-packed holiday, it is easy to fee

l the days have flown by all too quick. But 【M1】______ there is no need to worry about because once you return to the daily 【M2】______ grind your break will suddenly seem like it lasted for a lifetime. So say psychologists who believe that the effect is thanks to the 【M3】______ different methods the brain uses to judge the passage of time. Learning to manipulate our perception of time could make our lives feel fuller and reassure these who feel that the years slip by faster as 【M4】______ they grow older. In a normal fortnight an ordinary person only accumulates 【M5】______ between six to nine new memories because so much of what we do 【M6】______ is routine. But on the holiday we can build up that number of 【M7】______ memories in a single day because everything we experience is new, meaning that when we look back it will seem to have lasted much longer than it really did. The same happens because we get older and time starts to speed 【M8】______ up. There are fewer memories of new things, and we do the same things over and over. 【M9】______ People who complain that years seem to whizz past with increasing speed could slow things down by making the most of our 【M10】______ weekends and breaking up their daily routine. Taking a different route to work, getting off the bus a stop early or avoiding having the same sandwich for lunch every day could make life seem a little slower.

【M1】

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第9题

听力原文：M: Lesley, again and again these days we hear tile words "he's on drug" and many

people feel that these illegal drugs are harmful and people should be prevented from getting hold of them in any way at all, because of the damage they can do. What do you feel about this？

W: Oh, yes, you.., you've got to have some sort of control, because it has been proved that these some sort of thing, (19) can do irreparable damage, and I know a horrible story about a 16-year-old kid who is in mental hospital now. She went to a party and she took something there and now (20) she's convinced she's an orange and she won't go out of the room for fear somebody's going to squash her.

M: Lesley, how wide spread is the use of so-called illegal drugs in England？

W: Well, as regards cannabis (大麻)…um… (21)I think as yet little is known about it. I think it may be a rash thing to legalize it now when so little is known, but it must be said that no positive harm has been proved.

M: In view of hostility towards the so-called illegal drugs in things like newspapers and television, why do so many young people take drugs？

W: Well, I think there are many reasons. One of the reasons is because of hostility. (22)It's the job of the younger generation to reject all the values of the older generation, and it's just as well for human society that this is so, because otherwise we would never change it or make it better.

(23)

A．Harm that cannot be repaired.

B．Harm that are more powerful these days.

C．Damage that can be repaired.

D．Harm that are legalized.

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第10题

Sleep ,as we know, is important to us because it helps restore tired organs and tissues in

our body. But how much sleep do we actually need？

For most of us, eight hours seems to be about the right amount.【C1】______we know that there are many people who get【C2】______perfectly with less sleep, and some who may even need【C3】______. A great deal depend on the【C4】______we live. But a good general rule to【C5】______is to sleep as long as we have to in order to feel happy and be able to work【C6】______our best when we awaken.

There are actually different【C7】______of sleep. There is a deep sleep and a shallow sleep. In a shallow sleep our body does not get the same kind of rest it gets in a deep sleep, so that after eight hours of a【C8】______sleep we may still feel tired. But a short, deep sleep can be very【C9】______.

Alexander the Great was able to get a deep sleep【C10】______he needed it. Once, during the night before an important battle, he remained【C11】______much longer than anyone else.【C12】______he wrapped himself in a cloak and【C13】______down on the-earth. He slept so【C14】______that his generals had to wake him three times to give the【C15】______to attack!

Normally when we go to sleep, our!' sleep center" blocks off nerves so that【C16】______our brain and body go to sleep.【C17】______prevents us from wanting to do anything. And the other【C18】______our internal organs and limbs go to sleep.【C19】______sometimes only one goes to sleep and the other does not. A very tired soldier can sometimes【C20】______asleep(brain sleep)and keep on marching, because his body is not asleep.

【C1】

A．Yet

B．Hence

C．Anyway

D．Besides

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第11题

听力原文：M: Lesley, again and again these days we hear the words "he's on drugs" and many

people feel that these illegal drugs are harmful and people should be prevented from getting hold of them in any way at all, because of the damage they can do. What do you feel about this？

W: Oh, yes, you... you've got to have some sort of control, because it has been proved that these, some of these things, can do irreparable damage, and I know a horrible story about a 16-year-old kid who is in mental hospital now. She went to a party and she took something there and now she's convinced she's an orange and she won't go out of the room for fear somebody's going to squash her.

M: Lesley, bow wide spread is the use of so-called illegal drugs in England？

W: Well, as regards cannabis (大麻)... um... I think as yet little is known about it. I think it may be a rash thing to legalize it now when so little is known, but it must he said that no positive harm has been proved.

M: In view of hostility towards the so-called illegal drugs in things like newspapers and television, why do so many young people take drugs？

W: Well, I think there are many reasons. One of the reasons is because of hostility. It's the job of the younger generation to reject all the values of the older generation, and it's just as well for human society that this is so, be cause otherwise we would never change it or make it better.

(22)

A．Harm that cannot be repaired.

B．Harm that are more powerful these days.

C．Damage that can be repaired.

D．Harm that are legalized.

点击查看答案

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