Question

【题目】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】

试题分析：黑脉金斑蝶来自加拿大西部，每年飞行3000英里来到墨西哥中部的冬天的家，它们怎么能飞这么远？为什么它们要做这样长途而且危险的旅行？ 本文讲述了黑脉金斑蝶的特点及生活习性。

【1】B 题目推断题。题意：短文最好的标题可能是什么？A.Family of Monarch butterflies黑脉金斑蝶的家；B. Mystery of Monarch butterflies 黑脉金斑蝶之迷；C .Monarch butterflies’ birthplace黑脉金斑蝶的出生地；D .Monarch butterflies’ winter home黑脉金斑蝶的冬天的家。由文章第一段提出的一系列问题及下文科学家的一系列发现可以知道本文主要是写的黑脉金斑蝶之迷。故选B。

【2】A 推理判断题。题意：发现黑脉金斑蝶来自加拿大花了科学家多长时间？A.20 years二十年；B. four months四个月；C .five weeks五星期；D .eight months 八个月。由第二段的：For the next 20 years, he discovered that one butterfly started its journey in Canada.（在接下来20年里，他发现一只蝴蝶在加拿大开始了它的旅行）可以知道科学家花了二十年。故选A。

【3】D 细节理解题。题意：我们知道第几代黑脉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 可知今年迁徙到墨西哥的是玄孙辈，也就是第四代蝴蝶。故选D。

【4】C 词义猜测题。题意：文中有下划线的“offspring” 与哪一个的意思最接近？A. seasons季节；B. butterflies蝴蝶；C .children小孩；D .parents 父母。由倒数第二段的：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.（蝴蝶在这儿过冬，在春天它们生产、死去。他们的offspring将会成下一个生命环游的第一代）可以推测出offspring是他们的“孩子”，故选C。

【5】C 推理判断题。题意：根据短文下列陈述哪一个是对的？A.Monarch butterflies spend winter in eastern Canada. 黑脉金斑蝶在加拿大过冬；B .The four generations have the same length of life.四代黑脉金斑蝶有同样的生命长度；C .Some generations die on the way north to Canada.在去加拿大北的路上几代黑脉金斑蝶死掉了。D .Scientists are clear about everything of the butterflies科学家清楚黑脉金斑蝶的一切。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，两代黑脉金斑蝶出生了，生产了，然后死去了）可知本题选C。