Question

【題目】Monarch butterflies from eastern Canada make the most amazing journey in the insect world. Each year, this butterfly travels about 3000miles 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 find their way back to the same place? 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. On the trip north,two more generations are born, reproduce, and die. Each of these generations 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 home of its great-great-grandparents. The butterflies spend 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 to 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】

試題分析：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？為什么它們要做這樣長途而且危險的旅行？ 本文講述了黑脈金斑蝶的特點及生活習性。

【1】B 題目推斷題。題意：短文最好的標題可能是什么？A.Family of Monarch butterflies黑脈金斑蝶的家；B. Mystery of Monarch butterflies 黑脈金斑蝶之迷；C .Monarch butterflies’ birthplace黑脈金斑蝶的出生地；D .Monarch butterflies’ winter home黑脈金斑蝶的冬天的家。由文章第一段提出的一系列問題及下文科學家的一系列發(fā)現可以知道本文主要是寫的黑脈金斑蝶之迷。故選B。

【2】A 推理判斷題。題意：發(fā)現黑脈金斑蝶來自加拿大花了科學家多長時間？A.20 years二十年；B. four months四個月；C .five weeks五星期；D .eight months 八個月。由第二段的：For the next 20 years, he discovered that one butterfly started its journey in Canada.（在接下來20年里，他發(fā)現一只蝴蝶在加拿大開始了它的旅行）可以知道科學家花了二十年。故選A。

【3】D 細節(jié)理解題。題意：我們知道第幾代黑脈金斑蝶回到了墨西哥中部？A.first第一；B. second第二；C .third第三；D .fourth第四。由第四段中the butterfly that travels to Mexico this year is the great-great-grandchild 可知今年遷徙到墨西哥的是玄孫輩，也就是第四代蝴蝶。故選D。

【4】C 詞義猜測題。題意：文中有下劃線的“offspring” 與哪一個的意思最接近？A. seasons季節(jié)；B. butterflies蝴蝶；C .children小孩；D .parents 父母。由倒數第二段的：The butterflies spend 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.（蝴蝶在這兒過冬，在春天它們生產、死去。他們的offspring將會成下一個生命環(huán)游的第一代）可以推測出offspring是他們的“孩子”，故選C。

【5】C 推理判斷題。題意：根據短文下列陳述哪一個是對的？A.Monarch butterflies spend winter in eastern Canada. 黑脈金斑蝶在加拿大過冬；B .The four generations have the same length of life.四代黑脈金斑蝶有同樣的生命長度；C .Some generations die on the way north to Canada.在去加拿大北的路上幾代黑脈金斑蝶死掉了。D .Scientists are clear about everything of the butterflies科學家清楚黑脈金斑蝶的一切。由文章最后一段第三排:on the trip north, two generations are born, reproduce and then die（在去北方的行程中，兩代黑脈金斑蝶出生了，生產了，然后死去了）可知本題選C。