分析 【文中大意】这篇文章主要讲述了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呢?为什么它们要做这样长途而且危险的旅行?而这篇文章主要讲述了黑脉金斑蝶的特点以及生活习性.
解答 31 D 细节理解题.根据文章:For the next 20years,he discovered that one butterfly started its journey in Canada.可知在接下来的20年里,他发现一只蝴蝶在加拿大开始了它的旅行.所以科学家花了二十年.故选D.
32 A 细节理解题.根据文章: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.故选A.
33 C 词义猜测题.根据文章: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.可知蝴蝶在这过冬,在春天它们生产、死去.它们的offspring将会成下一个生命环游的第一代.所以可推测出offspring是他们的孩子.故选C.
34 C 细节理解题.根据文章:On the trip north,two more generations are born,reproduce,and die.可知在去北方的行程中,两代黑脉金斑蝶出生了,生产了,死去了.故选C.
35 B 标题归纳题.根据文章:这篇文章主要讲述了黑脉金斑蝶们怎么能飞这么远呢?为什么它们要做这样长途而且危险的旅行?这篇文章主要写的就是黑脉金斑蝶之谜.故选B.
点评 做题时先把文章快速通读一遍抓住其大意,本题主要涉及细节理解题目,要结合问题从文章中找到与之相关的句子,抓住关键词和细节进行选择,即可填入正确答案.
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