题目内容

【题目】 —You will fail in the exams ________ you work hard.

—I know, Dad. I'll try my best.

A. if B. unless C. as long as

【答案】B

【解析】

试题分析：句意：---如果你不努力学习，你考试就会失败。---我知道，爸爸。我会紧握最大努力的。A如果；B如果不；C只要。根据句意，故选B。

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The first thing to know is that the moon itself is never really blue. This is just an expression. In fact, the phrase” blue moon” has to do with the shape of the moon, not the color.

As the moon travels around the earth, it appears to change shape. We associate(联系) certain names with certain shapes of the moon. For example, when we can see a small part of the moon it is called a crescent moon. A crescent is a shape that looks like the tip（尖端） of a fingernail （手指甲）when we cannot see the moon at all, it is called a new moon. When we can see the whole moon, it is called a full moon. Usually, there is only one full moon every month. Sometimes, however there will be two full moons in one month. When this happens, the second full moon is called a blue moon”.

Over the next 20 years, there will only be 15 blue moons. As you can see, a blue moon is a very rare (稀有的)event. This factspan> has led people to use the expression” once in a blue moon” to describe other very rare events in their lives.

【1】Which of the following would be a good example of using the phrase” once in a blue moon”?

A．Simon often tells jokes. Simon tells jokes once in a blue moon.

B．Tom hardly remembers to do exercise. Tom does exercise once in a blue moon.

C．Mary likes to go shopping every weekend. Mary goes shopping once in a blue moon.

D．Cindy hates to do housework, but she does housework every day. Cindy does housework once in a blue moon.

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A．When the moon has a blue moon.

B．When we cannot see the moon at all.

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C．More than once a year.

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【4】What does the underlined part “This fact” in the last paragraph refer to?___________

A．A blue moon is a very rare event.

B．The moon appears to change shape.

C．The moon itself is never really blue.

D．A blue moon has to do with the shape of the moon.

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