分析 文章介绍了人类从很早就探索海洋,从中获取吃的,矿物质,财富等等,但是很长时间以来,他们只可以航海,但是没办法去海洋的下面去,潜水员要去水面以下,就必须带氧气瓶,并且水的压力是很大的,如果下去以后在回来时速度太快,就会有身体上的不适等.
解答 BAAC
50.B大意理解题.根据第二段的内容可知,人不能在水面以下呆的时间太长,如果去探索深海,会面临更大的危险;根据第三段的内容可知,潜水员去水下的时候要带氧气瓶,水的重量是空气重量的800倍,因此要承担很大的压力.以及潜水员去水深处时,他的血液会吸收他呼吸的气体,急速反回时,会有更大的危险.故选B.
51.A细节判断题.根据最后一段Tons of water pushes against a diver deep in the sea.so his body is under great pressure.可知潜水员在深海中承受着巨大的压力.故选A.
52.A细节理解题.根据最后一段When a diver is under great pressure,his blood takes in some of the gases he breathes.As he rises to the surface,the water pressure becomes less.If the diver rises too quickly,the gases in his blood form bubbles(气泡).可知潜水员要承认很大的压力,血液会吸收他呼吸的气体,如果返回太快,血液里的气体会形成气泡,就会患上减压病,会承受痛苦,甚至有生命危险,由此可知,运动员身体必须健康.故选A.
53.C理解判断题.根据最后一段If the diver rises too quickly,the gases in his blood form bubbles(气泡).The diver is then suffering from a kind of illness.可知如果潜水员上升太快,他血液中的气体会形成气泡.由此他们将会患一种病.故选C.
点评 点评:阅读这类文章时,也应该在整体把握文章结构的前提下,主要注意细节信息.细节题题干都是相应原文的变形(如同义改写、词性转换等),因此要找到答案一定要找到题干在原文中的出处,再把原文和选项相比较.做题时,根据所提问题用寻读、跳读的方法可达到事半功倍的效果.
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