单选题

We find that the moon is about 239,000 miles away from the earth, and that within a few thousand miles, its distance always remains the same. Yet a very little observation shows that the moon is not standing still. Its distance from the earth remains the same, but its direction continually changes. We find that it is traveling in a circle — or very nearly a circle — round the earth, going completely round once a month, or more exactly, once every

days. It is our nearest neighbor in space, and like ourselves it is kept tied to the earth by the earth's gravitational pull (地心吸力).
Except for the sun, the moon looks the biggest object in the sky. Actually it is one of the smallest, and only looks big because it is so near to us. Its diameter (直径) is only 2,160 miles, or a little more than a quarter of the diameter of the earth.
Once a month, or, more exactly, once every

单选题 The distance between the moon and the earth is ______ .

A、 a bit more than two hundred and forty thousand miles
B、 a little less than two hundred and forty thousand miles
C、 about two thousand one hundred and sixty miles
D、 about eight thousand miles

【正确答案】 B

【答案解析】此题题干问“月球和地球之间的距离是多少”。在原文第1段第1句话指出月球和地球之间的距离是239 000英里。因此选项B. a little less than two hundred and forty thousand miles是正确答案。

单选题 It takes ______ for the moon to move round the earth.

A、 about thirty days
B、 about twenty-eight days
C、 twenty-seven days and eight hours
D、 twenty-nine days and twelve hours

【正确答案】 C

【答案解析】本题题干问“月球围绕地球转一圈要多长时间”。原文第1段第4句话指出月球围绕地球转一圈要

单选题 The diameter of the earth is about ______ .

A、 2,160 miles
B、 8,000 miles
C、 6,000 miles
D、 4,000 miles

【正确答案】 B

【答案解析】此题题干问“地球的直径是多少”。在原文第2段第3句话指出月球的直径是2160英里，是地球直径的

单选题 ______ which is lighted up by the sun is bright, at the other times.

A、 Only a part of the moon
B、 Only one-fourth of the moon
C、 At least the half of the moon
D、 More than one third of the surface of the moon

【正确答案】 A

【答案解析】此题题干问“月球的多少部分是被太阳照亮的”。原文第3段第2句话指出月球面对太阳的一部分是被太阳所照亮的。因此选项A. Only a part of the moon是正确答案。

单选题 The moon is like a huge mirror hung in the sky ______ .

A、 because it is very near the earth
B、 because there is some water on the moon
C、 because there are some river and lakes on the moon
D、 because of its reflection of sunlight

【正确答案】 D

【答案解析】本题题干问“为什么月球就像一面巨大的镜子挂在空中”。原文第3段第4句话指出月球反射太阳光就像一面巨大的镜子挂在空中。因此选项D. because of its reflection of sunlight是正确答案。