①On a clear night, go outside and look for the moon. Do the same thing again a week later, and the moon you see will look different. So why does it always seem to change its shape?

②Sometimes, the moon is a bright disk that lights up the night sky. Other times, it is just a white sliver. Sometimes, the moon can be seen during the day. Other times, it can not be seen. These different kinds of visibility (可见度) are called the phases of the moon (月相).

③They appear because the sun, the moon and the Earth are always moving. One thing that almost never changes is that the sun lights one side of the moon.

④A lunar eclipse (月食) is the only time the sun can’t face the moon. This appears when the sun, the moon and the Earth are in a straight line with the Earth in the middle. As the moon travels into the darkness of the Earth’s shadow (影子), it seems as though all or part of it disappears.

⑤Many scientists believe that the moon was once part of the Earth. Millions of years ago, something hit into the Earth and broke off a large part of the planet. Gravity (地球引力) kept this huge block from going away into space, and it became our moon.

【小题1】The first paragraph is mainly written to ________.

A．draw the readers’ interest	B．tell a moving story to readers
C．list some examples for readers	D．help readers finish the exam

【小题2】The main idea of Paragraph 2 is ________.

A．the stories of the phases of the moon	B．the meaning of the phases of the moon
C．the reasons for the phases of the moon	D．the time when the phases of the moon happen

【小题3】Which of the following shows how lunar eclipse is formed?

A．	B．
C．	D．

【小题4】The structure of the passage is ________.

A．①②③④；⑤

B．①；②③④⑤

C．①②③；④；⑤

D．①；②③④；⑤