分析 文章介紹了人類從很早就探索海洋,從中獲取吃的,礦物質(zhì),財富等等,但是很長時間以來,他們只可以航海,但是沒辦法去海洋的下面去,潛水員要去水面以下,就必須帶氧氣瓶,并且水的壓力是很大的,如果下去以后在回來時速度太快,就會有身體上的不適等.
解答 BAAC
50.B大意理解題.根據(jù)第二段的內(nèi)容可知,人不能在水面以下呆的時間太長,如果去探索深海,會面臨更大的危險;根據(jù)第三段的內(nèi)容可知,潛水員去水下的時候要帶氧氣瓶,水的重量是空氣重量的800倍,因此要承擔很大的壓力.以及潛水員去水深處時,他的血液會吸收他呼吸的氣體,急速反回時,會有更大的危險.故選B.
51.A細節(jié)判斷題.根據(jù)最后一段Tons of water pushes against a diver deep in the sea.so his body is under great pressure.可知潛水員在深海中承受著巨大的壓力.故選A.
52.A細節(jié)理解題.根據(jù)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(氣泡).可知潛水員要承認很大的壓力,血液會吸收他呼吸的氣體,如果返回太快,血液里的氣體會形成氣泡,就會患上減壓病,會承受痛苦,甚至有生命危險,由此可知,運動員身體必須健康.故選A.
53.C理解判斷題.根據(jù)最后一段If the diver rises too quickly,the gases in his blood form bubbles(氣泡).The diver is then suffering from a kind of illness.可知如果潛水員上升太快,他血液中的氣體會形成氣泡.由此他們將會患一種病.故選C.
點評 點評:閱讀這類文章時,也應(yīng)該在整體把握文章結(jié)構(gòu)的前提下,主要注意細節(jié)信息.細節(jié)題題干都是相應(yīng)原文的變形(如同義改寫、詞性轉(zhuǎn)換等),因此要找到答案一定要找到題干在原文中的出處,再把原文和選項相比較.做題時,根據(jù)所提問題用尋讀、跳讀的方法可達到事半功倍的效果.
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