题目内容（请给出正确答案）

[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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更多“Because we can feel that thing…”相关的问题

第1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

点击查看答案

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

点击查看答案

第3题

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

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

点击查看答案

第4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5题

听力原文：Why can't we go to the island today？（A)Because they were isolated that time.（B)We

听力原文：Why can't we go to the island today？

(A) Because they were isolated that time.

(B) We are expecting heavy rain today.

(C) That' s why we couldn' t get there on time.

(28)

A．

B．

C．

点击查看答案

第6题

We feel an object is heavyA. because weight is a fixed quality in an object.B. because the

We feel an object is heavy

A. because weight is a fixed quality in an object.

B. because they are far away from the centre of the earth.

C. because of the earth's strong attraction for them.

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

点击查看答案

第7题

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

gs 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 example, we feel it during the takeoff of an airplane.

We feel the plane's acceleration because our bodies do not get 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 speed, the feeling forward motion stops.

8. What lets us know that we are moving？

(13)

A．Our body.

B．Our senses.

C．The speed.

D．The plane.

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第8题

We can conclude from this passage that camels ______. A. feel at home in the desert B

We can conclude from this passage that camels ______.

A. feel at home in the desert

B. like to carry heavy loads

C. look like ships from a distance

D. will always be useful

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第9题

We can safely conclude from the text that ______.A．vertebrates feel pain because they have

We can safely conclude from the text that ______.

A．vertebrates feel pain because they have vertebrae

B．animals do not experience pain although they are equipped with all the necessary neurological structures

C．animals do not feel pain because they haven't developed fore-brains yet

D．none of the above

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