15.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.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 20years,he discovered that one butterfly started its journey in Canada.Four months later,it arrived in Mexico.
The length of the butterflies finds 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(一代)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,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.
31.How long did it take the scientist to find out that monarch butterflies came from Canada?D
A.eight months         
B.four months       
C.five weeks        
D.20years
32.We know that theA generation of Monarch butterflies travels back to central Mexico.
A.fourth              
B.second            
C.third             
D.first
33.The underlined word"offspring"in paragraph 5meansC.
A.seasons            
B.butterflies          
C.children          
D.parents
34.Which of the following is TRUE according to the passage?C
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
35.What is the best title of this passage?B
A.Family of Monarch butterflies.
B.Mystery of Monarch butterflies.
C.Monarch butterflies'birthplace.
D.Monarch butterflies'winter home.

分析 【文中大意】這篇文章主要講述了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?cè)趺茨茱w這么遠(yuǎn)呢?為什么它們要做這樣長(zhǎng)途而且危險(xiǎn)的旅行?而這篇文章主要講述了黑脈金斑蝶的特點(diǎn)以及生活習(xí)性.

解答 31  D 細(xì)節(jié)理解題.根據(jù)文章:For the next 20years,he discovered that one butterfly started its journey in Canada.可知在接下來的20年里,他發(fā)現(xiàn)一只蝴蝶在加拿大開始了它的旅行.所以科學(xué)家花了二十年.故選D.
32  A 細(xì)節(jié)理解題.根據(jù)文章: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.故選A.
33  C 詞義猜測(cè)題.根據(jù)文章: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.可知蝴蝶在這過冬,在春天它們生產(chǎn)、死去.它們的offspring將會(huì)成下一個(gè)生命環(huán)游的第一代.所以可推測(cè)出offspring是他們的孩子.故選C.
34  C 細(xì)節(jié)理解題.根據(jù)文章:On the trip north,two more generations are born,reproduce,and die.可知在去北方的行程中,兩代黑脈金斑蝶出生了,生產(chǎn)了,死去了.故選C.
35  B 標(biāo)題歸納題.根據(jù)文章:這篇文章主要講述了黑脈金斑蝶們?cè)趺茨茱w這么遠(yuǎn)呢?為什么它們要做這樣長(zhǎng)途而且危險(xiǎn)的旅行?這篇文章主要寫的就是黑脈金斑蝶之謎.故選B.

點(diǎn)評(píng) 做題時(shí)先把文章快速通讀一遍抓住其大意,本題主要涉及細(xì)節(jié)理解題目,要結(jié)合問題從文章中找到與之相關(guān)的句子,抓住關(guān)鍵詞和細(xì)節(jié)進(jìn)行選擇,即可填入正確答案.

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