54. A new f______ is being built in our city. We will go everywhere more easily.

53. a particular place or position where someone or something is -______

52. an organization to which you give money so that it can give money and help to people who are poor, ill etc. - ______

51. a list of names, subjects etc. at the back of a book -______

50. 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

第四节 词汇(共10小题；每小题1.5分，满分15分)

根据英文注释、首字母提示或汉语提示写出相应的单词。

49. 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

48. 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.

47. Which of the following statements is true?

A. The earth is farther from the sun than any other planet in the sun’s family.

B. The planets travel in the sky in their own ways disorderly instead of definite paths.

C. The earth is the nearest to the sun among the planets.

D.　　 Of all the planets, the earth makes the third longest trip around the sun.

46. 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

45. Which of the following is this passage about?

　 A. Bad luck.　　　　　 B. Good luck.　　　　　 C. Happiness.　　　　 D. Life.

D

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 (重力) 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.