Everyone knows what the moon looks like from Earth. But what about the far side which we can’t see?

For centuries, that was a mystery, and even more recently there wasn't much to go on. We only had a handful of grainy images returned by the Soviet Luna 3 probe, which flew around the moon in October, 1959, a decade before the first humans set foot on its surface.

But since the summer of 2009, scores of new images have been created thanks to NASA’s Lunar Reconnaissance Orbiter. Its laser altimeter and camera are providing some of the most detailed looks of the moon. This makes it possible to see the moon from its back. 

The thing that stands out most is that side of the moon facing away from the Earth doesn't have those dark spots. Rather, there are craters of all sizes. And lots of them.

From the angle above, the Earth looms in the background. And while the moon looks to be almost full from this point, it will only be a crescent when seen from Earth.

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1.What does the moon look like from the earth?

A Flat.

B Grainy.

C Colorful.

D Dark.

解析：选B。B 细节理解题。根据第二段第二句We only had a handful of grainy images…可知，故选B。

2.When did human first step on the moon?

A In 1959.

B In 1969.

C In 1979.

D In 1964.

解析：选B。B 判断推理题。根据第二段内容“苏联探月3号”于1959年绕月飞行后十年，人类首次踏上月球可知，故选B。

3.What does the underlined word “Its” refer to in paragraph 3?

A NASA.

B NASA’s Lunar Reconnaissance Orbiter.

C Laser altimeter.

D Soviet Luna 3 probe.

解析：选B。B 语义理解题。根据第三段thanks to NASA's Lunar Reconnaissance Orbiter.（多亏了美国航天航空局的月球轨道飞行器）可知，故选B。

4.What is on the side of the moon that we cannot see from the earth?

A Dark spots.

B High mountains.

C Chang’e and her rabbit.

D Craters of all sizes.

解析：选D。D 细节理解题。根据第四段最后两句Rather, there are craters of all sizes. And lots of them.可知，故选D。

5.When the moon looks full from its back on the picture, it is____________from its front.

A a crescent

B full

C a half

D invisible

解析：选A。A 内容理解题。根据最后一段内容可知当从图片中角度看月球是满月的时候，从地球上看月球却是一弯新月，故选A。