Question

【題目】

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.

Answer 1

【答案】

【1】B

【2】A

【3】D

【4】C

【5】C

【解析】

文章大意：本文主要講述了黑脈金斑蝶的特點(diǎn)及生活習(xí)性。黑脈金斑蝶來自加拿大西部，每年飛行3000英里來到墨西哥中部的冬天的家，它們怎么能飛這么遠(yuǎn)？為什么它們要做這樣長途而且危險(xiǎn)的旅行呢？

【1】主旨大意題。通過對整篇文章的理解可知，本文主要介紹了一種神秘的物種黑脈金斑蝶，故答案選B。

【2】細(xì)節(jié)理解題。根據(jù)文中的句子For the next 20 years, he discovered that one butterfly started its journey in Canada.可知科學(xué)家花了20年的時(shí)間才發(fā)現(xiàn)黑脈金斑蝶來自加拿大，故答案選A。

【3】細(xì)節(jié)理解題。根據(jù)文中的句子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.可知，只有每四代才能完成向南行的旅行，故答案選D。

【4】詞義猜測題。根據(jù)后文will be the first generation of the next circle of life將是下一代生命的第一代，可知是蝴蝶的孩子將會是下一代的第一代，所以這個(gè)單詞的意思應(yīng)是“孩子”的意思，故答案選C。

【5】理解判斷題。A．Monarch butterflies spend winter in eastern Canada．黑脈金斑蝶在加拿大東部過冬；根據(jù)文中的句子"Each year，this butterfly travels about 3000 miles to its winter home in central Mexico"可知A選項(xiàng)是錯(cuò)誤的。B．The four generations have the same length of life．四代有著相同時(shí)間的壽命；根據(jù)文中的句子"In the autumn，the fourth generation of butterflies is born．This generation has a much longer life"可知B選項(xiàng)是錯(cuò)誤的；C．Some generations die on the way north of Canada．綜合第五段文意，可知四代黑脈金斑蝶在北上加拿大的長途遷徙當(dāng)中，不斷的繁衍，死去；可知C選項(xiàng)是正確的； D．Scientists are clear about everything of the butterflies．科學(xué)家們對黑脈金斑蝶的一切都很了解；根據(jù)文章最后一段Today, people are still studying the Monarch butterfly. But they are not clear about everything.可知D選項(xiàng)是錯(cuò)誤的。本題題意是問哪一個(gè)陳述是正確的，故答案選C。