—Which is ________, the sun, the moon or the earth?

—Of course the moon is.

A. small　　　　　　　　 B. smaller　　　　　　　 C. the smallest

--- Which is ________, the sun, the moon or the earth?

--- Of course, the moon is.

[　　]

Of course, the moon is.

A. small　　　　　　　　 B. smaller

C. smallest　　　　　　 D. the smallest

[　　]

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

　　Two of them are nearer while the other six 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 made travelling bodies move around in the sky in definite(一定的) paths.

　　We know that every little bit of matter in the universe pulls upon every other bit of matter. There exists(存在) a pull between the earth and the moon, which keeps the moon travelling in its orbit(轨道) around our planet, the earth. The gravity(重力) 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 (施加) a greater pull on any body than smaller ones which contain(含有) less material (原料，材料). But each object in the universe, no matter how small, pulls on all other objects to some degree(某种程度).

1．According to the passage, there are ________ fellow members besides the earth in the sun's family.

[　　]

2．Which of the following statements is TRUE?

[　　]

A．The earth is farther from the sun than any of the other eight planets.

B．Two of the planets are farther from the sun than the earth.

C．Six of the planets are closer to the sun than the earth.

D．The earth is the third nearest planet to the sun.

3．What holds the nine planets in their paths?

[　　]

4．Why the moon travels around the earth is ________ .

[　　]

A．that the sun pulls upon the moon

B．that the earth pulls upon the moon

C．that the earth and the moon pull upon each other

D．that the other eight planets pull upon the moon

5．In the last paragraph the writer tell us ________ .

[　　]

A．each object in the universe pulls upon all the others more or less

B．a large body pulls on a small one less than a small body pulls on a large one

C．a small body does not pull on a large one

D．the pull between two bodies is always equal(相等)