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On Wednesday, much of the world got to see not only a blue moon and a "supermoon", but also a total lunar eclipse(月全食). Having all three events taking place at the same time is extremely unusual. Astronomers say this has not happened since 1982. And it won't happen again until 2037.

A total lunar eclipse happens when the Earth comes between the Sun and a full moon. The Earth blocks the sun's light, making the moon appear dark in the sky. The eclipse was easiest to see in the western half of the United States and Canada before the moon set early on Wednesday morning. It was visible across the Pacific Ocean into East Asia as the moon rises Wednesday night into Thursday. The U.S. East Coast, however, was out of luck. The moon was setting just as the eclipse got started. Europe, most of Africa and South America also missed out.

A blue moon is a second full moon in one month. It is rare(罕见的) enough that English speakers use the expression "once in a blue moon" to describe something that does not happen often! A supermoon is a full or new moon. It appears brighter and bigger than usual because the moon is closer to the earth than usual. Some people are calling this week's lunar event a "super blue blood moon."

1.When did the supermoon happen?

A On Tuesday.

B On Wednesday.

C On Thursday.

D On Friday.

解析：选B。细节理解题。根据第一段第一句On Wednesday, much of the world got to see not only a blue moon and a "supermoon," but also a total lunar eclipse. 可知，发生超级月亮发在周三，故选B。

2.What does the expression “once in a blue moon” mean?

A Always happen.

B Usually happen.

C Often happen.

D Seldom happen.

解析：选D。细节理解题。根据最后一段第二句...the expression "once in a blue moon" to describe something that does not happen often!可知，once in a blue moon意为“极为罕见”，故选D。

3.The underlined word “visible” can be replaced by ______.

A seen

B touched

C felt

D tasted

解析：选A。词义猜测题。visible表示可看到的，与seen同义，故选A。

4.Where may you see the passage?

A In a postcard.

B In a science website.

C In a fashion magazine.

D In a storybook.

解析：选B。推理判断题。全文报道了周三晚超级蓝色血月的相关情况，可以在科技网站上看到，故选B。