The earth is not the only body that travels a...

The earth is not the only body that travels around the sun. With it are eight other planets, fellow members of the sun’s family.

Two of them, Mercury (水星) and Venus, are nearer while the other six, namely Mars, Jupiter, Saturn, Uranus, Neptune and Pluto, also in their given order from the sun, are farther from the sun than the earth is. The farther they are, the longer trips they make around the sun. People noticed long ago that these traveling bodies moved around in the sky in definite paths. It is a force called gravity that holds them in their paths.

We know that every little bit of matter in the universe pulls upon every other bit of matter. The pull between two bodies is proportional (成比例的) to the product of their masses. Because the sun is so large the pull between the sun and the planets are thus great. If it were not for this pull, the planets would fly off into space. In the same way there exists a pull between the earth and the moon, which keeps the moon traveling in its orbit around our planet, the earth. Gravity holds you to its surface, and pulls back to it the ball which you throw into the air. Of course the ball also pulls on the larger earth but the earth is so much larger that the pull is not noticed.

Now remember that large bodies exert a greater pull than smaller ones which contain less material. But each object in the universe, no matter how small, pulls on all other objects to some degree.

1.There are ________ that travel around the sun in the sun’s family.

A．nine planets                           B．eight planets

C．one star and ten planets                  D．the earth and the sun

2.Which two planets make the longest trips around the sun among all the planets in the solar system?

A．Mercury and Venus.                     B．Neptune and Pluto.

C．Saturn and Uranus.                      D．Mars and Jupiter.

3.From the passage we can see__________

A．all the objects, big or small, must exert the same pull on one another

B．large objects exert the same pull on anybody as small objects

C．small objects exert the same on large ones

D．each object in the universe exerts a pull on all other objects

4.From the sentence “The pull between two bodies is proportional to the product of their masses.” We can infer that the pull between__________

A．the sun and the moon is greater than between the sun and the earth

B．the earth and the moon is greater than that between the sun and the earth

C．the sun and the earth is greater than that between the earth and the moon

D．the sun and the earth is the same as that between the earth and the moon

高二英语阅读理解中等难度题查看答案及解析

When I was in primary school, I was told that the earth ______around the sun.

高二英语单项填空简单题查看答案及解析

Personal space means not only an imaginary space around the body, but _____ around all the senses.

A．it                B．one              C．that              D．the one

高二英语单项填空中等难度题查看答案及解析

Titan is believed to be the only body in _____ solar system other than the Earth with liquid on ______ surface.

A. the; /               B. /; the               C. /; /             D. the; the

高二英语单项填空中等难度题查看答案及解析

___ is known to us all is ____ the sun is bigger than the earth.

A It; that    B What ; that   C What ; how    D That; that

高二英语单项填空简单题查看答案及解析

______________ with the sun, the earth is not big at all.

高二英语单项填空中等难度题查看答案及解析

Like many others who travel around, Louis admitted that the worst part of touring

is not being able to see her family and friends _____ she would like.

A more than              B less than              C as well as       D as much as

高二英语单项填空简单题查看答案及解析

Space is a dangerous place, not only because of meteors (流星 ) but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through, and this is essential for plants to make the food which we eat. Heat, too, makes our environment endurable（可忍受的）. Various kinds of rays come through the air from outer space, but enormous quantities of radiation（辐射） from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation but their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage.

Radiation is the greatest known danger to explorers in space. The unit of radiation is called "rem". Scientists have reason to think that a man can put up with far more radiation than 0.1 rem without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is extremely difficult to be sure about radiation damage - a person may feel perfectly well, but the cells of his or her sex organs may be damaged, and this will no be discovered until the birth of abnormal children or even grandchildren.

Missions of the Apollo flights have had to cross belts of high amount of rems. So far, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short. We simply do not know yet how men are going to get on when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage done by radiation, but no really effective ones have been found so far.

1. According to the first paragraph, the atmosphere is essential to man in that ____.

A. it protects him against the harmful rays from space

B. it provides sufficient light for plant growth

C. it supplies the heat necessary for human survival

D. it screens off the falling meteors

2. We know from the passage that ____.

A. exposure to even tiny amounts of radiation is deadly

B. the effect of exposure to radiation is slow in coming

C. radiation is avoidable in space exploration

D. astronauts in spacesuits needn't worry about radiation damage

3. The harm radiation has done to the Apollo crew members ____

A. is significant            B. seems overestimated

C. is enormous             D. remains unknown

4. It can be inferred from the passage that ____.

A. the Apollo mission was very successful

B. protection from space radiation is no easy job

C. astronauts will have deformed children or grandchildren

D. radiation is not a threat to well-protected space explorers

45. The best title for this passage would be ____.

A. The Atmosphere and Our Environment   B. Research on Radiation

C. Effects of Space Radiation             D. Importance of Protection Against Radiation

高二英语阅读理解简单题查看答案及解析

Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through, and this is necessary for plants to make the food that we eat. Heat, too, makes our environment endurable. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation but their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage.

Radiation is the greatest known danger to explorers in space, The unit of radiation is called “rem” Scientists have reason to think that a man can put up with far more radiation than 0.1rem without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is extremely difficult to be sure about radiation damage. A person may feel perfectly well, but the cells of his or her sex organs may be damaged, and this will not be discovered until the birth of deformed children or even grandchildren. Missions of the Apollo flights have had to cross belts of high radiation and , during the outward and return journeys, the Apollo crew accumulated(积累) a large amount of rems. So far, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short. We simply do not know yet how men are going to get on when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage done by radiation, but no really effective ones have been found so far.

1.In which way is the atmosphere necessary to man according to the first paragraph?

A. It screens off the falling meteors.

B. It provides enough light for plants to grow.

C. It supplies the heat necessary for human survival.

D. It protects him against the harmful rays from space.

2.We know from the passage that 　　　　　　 .

A. exposure to even tiny amount of radiation is fatal( 致命的)

B. the effect of exposure to radiation is slow in coming

C. radiation is avoidable in space exploration

D. astronauts in spacesuits needn’t worry about radiation damage

3.The underlined word “deformed” probably means 　　　　 .

A. badly-shaped　　 　　 B. weak

C. naturally-grown　　　 D. ugly

4.It can be inferred from the passage that 　　　　　　　　 .

A. the Apollo mission was very successful

B. astronauts will have deformed children or grandchildren

C. protection from space radiation is no easy job

D. radiation is not a threat to well-protected space explorers

高二英语阅读理解中等难度题查看答案及解析

______ is known to everybody, the moon travels round the earth every month.

A .It   B. That    C. As   D. Why

高二英语单项填空简单题查看答案及解析