题目内容
11.Around the world coral reefs(珊瑚礁) are facing threats brought by climate change and great changes in sea temperatures.While ocean warming has been the primary focus for scientists and ocean policy managers,cold events can also whiten corals.A new study by scientists compared damage to corals caused by heat as well as cold stress.The results show that cool temperatures can cause more damage in the short term,but heat is more destructive in the long run.Climate change is widely known to produce warming conditions in the oceans,but extreme cold-water events have become more frequent and serious as well.I 2010,for example,coral reefs around the world faced one of the coldest winters and one of the hottest summers on record.
During a unique experiment,corals under cold temperatures suffered greater damage in just days compared with the heat treated corals.Yet the researchers found that corals were eventually able to adjust to the cold conditions,make their health stable and continue to grow.However,over the long term corals subjected to heat suffered more greatly than those in cold,with evidence of severe whitening and growth stoppage,which leads to death.
The coral's ability to adjust to cool temperatures surprised the researchers,who say the study's results show the complexities of monitoring coral health in response to different environmental factors.
"Global warming is associated with increases but also decreases of temperatures,"said Deheyn,one of the researchers."Not much has been known about the comparative effects of temperature decrease on corals.These results are important because they show that corals react differently to temperature differences,which is important for future management of coral reefs in the field of climate change."
66.According to the first paragraph,we know thatB.
A.different corals suffer differently by climate change.
B.both heat and cold stress affect corals.
C.cool temperature is more destructive to corals.
D.it's hard to know the effect of climate change on corals.
67.The phrase"subjected to"(in Paragraph 3)is closest in meaning to"C
".
A.referred to
B.adjusted to
C.exposed to
D.stuck to
68.By"Not much has been known about…"Deheyn probably means thatA.
A.we know very little about the effects of temperature decrease on corals
B.temperature decrease is not expected to have a bad effect on corals
C.it makes no sense to study the effects of temperature decrease on corals
D.corals may not have been affected by the decrease in temperature.
69.What is the passage mainly about?D
A.measures should be taken to control global warming.
B.Climate change has resulted in more cold currents.
C.Heat is responsible for the destruction of corals.
D.Heat can cold damage corals in their own ways.
分析 本文主要介绍了全球的海洋珊瑚礁正在受到气温变化的破坏,极热和极冷以自己的方式破坏着珊瑚礁.但研究证明,珊瑚礁适应冷的温度的能力比热的更强.这对未来气候变化领域的珊瑚礁的管理是非常重要的.
解答 66.B 细节理解题,由第一段The results show that cool temperatures can cause more damage in the short term,but heat is more destructive in the long run.可知凉爽的温度可以在短期内造成更大的伤害,但在长时间受热破坏性更大,故选B.
67.C 理解推断题,由第三段However,over the long term corals subjected to heat suffered more greatly than those in cold,可知长期受热的珊瑚遭受的明显多于寒冷气温下的珊瑚,由此推断"subjected to"的意思是"暴露在",故选C.
68.A 理解推断题,由最后一段Not much has been known about the comparative effects of temperature decrease on corals.可知没有多少人知道温度下降对珊瑚的影响,故选A.
69.D 主旨大意题,本文主要介绍了全球的海洋珊瑚礁正在受到气温变化的破坏,极热和极冷以自己的方式破坏着珊瑚礁,故选D.
点评 本文考察学生的理解推断能力以及细心程度,只要抓住文章的关键词,采用寻读的方法查找细节,就能找到正确答案.
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