Read the sentences aloud, please. And ______ the use of the word “expression”.

A. come up with B. take care of C. pay attention to

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Monarch butterflies from eastern Canada make the most amazing journey in the insect world. Each year, this butterfly travels about 3 000 miles to its winter home in central Mexico(墨西哥). How can it fly so far? And why does it make this long and dangerous trip? Scientists still don't have an answer.

For many years, people in Mexico wondered where the orange and black butterflies came from every winter. Then, in 1937, a scientist started to follow and study the butterflies. For the next 20 years, he discovered that one butterfly started its journey in Canada. Four months later, it arrived in Mexico.

The length of the butterflies' trip is only one part of the mystery. Another amazing thing is that the butterflies always return to the same area in central Mexico.

How do the butterflies find their way back to the same place? This is an interesting question because only every fourth generation(代) makes the trip south. In other words, the butterfly that travels to Mexico this year is the great great grandchild of the butterfly that traveled there last year.

Each year, four generations of a Monarch butterfly family are born. Each generation of the family has a very different life. The first generation is born in the south in late April. It slowly moves north, reproduces(繁衍), and then dies. Each of these generations of butterflies lives for generations are born, reproduces, and die. Each of these generations of butterflies lives for only two or five weeks. In the autumn, the fourth generation of butterflies is born. This generation has a much longer life. It lives for about eight months. This generation of butterflies makes the amazing journey back to the winter there, and in the spring they reproduce and then die. Their offspring will be the first generation of the next circle of life.

Today, people are still studying the Monarch butterfly. But they are not clear about everything.

1.The best title of the passage can be ________.

A. Family of Monarch butterflies

B. Mystery of Monarch butterflies

C. Monarch butterflies' birthplace

D. Monarch butterflies' winter home

2.It took the scientist ________to find out that Monarch butterflies came from Canada.

A. 20 years B. four months C. five weeks D. eight months

3.We know that the ________ generation of Monarch butterflies travel back to central Mexico.

A. first B. second C. third D. fourth

4.The underlined word “offspring” in the passage is closest in meaning to ________.

A. seasons B. butterflies C. children D. parents

5.Which statement is TRUE according to the text?

A. Monarch butterflies spend winter in eastern Canada.

B. The four generations have the same length of life.

C. Some generations die on the way north of Canada.

D. Scientists are clear about everything of the butterflies.

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書面表達。

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