47.What can we learn from the passage?
A.The temperature in Arctic is rising faster than that in Antarctica.
B.The ocean food chain breaks due to the melting of icebergs.
C.Floating icebergs help shelter bottom-living ocean creatures.
D.Global warming has kept bringing icebergs into being.
答案 D [细节理解题。根据第二段第一句可知D项正确。根据第二段第四句...the average atmospheric temperature...among the fastest warming on earth.可知A项错误;根据第四段第四句Grounded bergs can...from free floating icebergs可知C项错误;根据第四段第五句However,large bergs...at its first link.可知B项不正确。]
48.From the passage we can conclude that icebergs can ________.
A.preserve ocean creatures
B.carry ocean nutrients away
C.create a warm polar environment
D.keep sea animals away from polar seas
答案 A [细节理解题。根据第四段第三句They fertilize the ocean with nutrients,increasing sea creature production.可知A项正确。]
49.What is the author's attitude toward icebergs?
A.Cautious.
B.Objective.
C.Doubtful.
D.Disapproving.
答案 B [推理判断题。通读全文可知作者只是在客观描述事实,并未表达任何个人观点,因此B项正确。cautious意为“谨慎的”;doubtful意为“怀疑的”;disapproving意为“不赞成的”。]
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