分析 文章大意:这是一篇说明文,主要讲的是关于雪花的,雪花其实有不同的颜色的,在许多国家曾经下过不同颜色的雪花,还讲了雪花形成的原因.没有两个同样大小或相同形状的雪花,像头那么大的雪花从天而降,这样的事情曾经在我国发生过.
解答 48.答案:B.细节理解题.根据第三段第五句When air is cold and dry,the falling snowflakes are small and hard.当空气寒冷干燥时,飘落的雪花又小又硬.可知,如果天气是冷的和干燥的,雪花会又小又硬.选B.
49.答案:D.细节理解题.根据最后一段Would you be surprised to see snowflakes as big as your head falling from the sky?It occurred(发生) once in our country.It could occur again.你会惊奇地看到雪花像你的头一样大,从天空坠落一样吗?它曾经在我们国家发生过,可能会再次发生.可知,应该是不经常发生这样的事情,选D.
50.答案:A.推理判断题.根据第二段第三句It was found that such snow was mixed with ashes (灰).This made it seem dark.Red snow has come down in other countries.When this happened,it was mixed with red dust.人们发现这样的雪和灰混合在一起,这使雪花看起来很黑,在其他国家,红色雪已经落下,当它发生的时候,它和红色的灰尘混合在一起.可知,A选项"彩色雪花看起来如此,因为它们与不同颜色的灰尘混合."是正确的.选A.
点评 阅读题型,要注重句子与句子之间、段落与段落之间逻辑关系以及对篇章的整体理解.根据所给问题选择正确选项完成试题.
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