题目内容
2.A 16-year survey on the arctic Norwegian island of Svalbard found the reindeer(驯鹿)there have declined in weight by an alarming 12percent.The reduction in average body-mass is being blamed on global warming.In research presented lately at a meeting of the British Ecological Society in Liverpool,scientists will explain how rising temperatures are making female reindeer difficult to obtain nutrients during important periods of being pregnant.
Snow in Svalbard typically covers the ground for eight months of the year,which,combined with low temperatures,limits grass growth to June and July.But as summer temperatures have increased by around 1.5℃,grasslands have become more productive,allowing female reindeer to gain more weight by the autumn and therefore to conceive(孕育)more calves.
However,warmer winters have brought with them greater rainfall which freezes when is settles on the snow,therefore locking out the reindeer from the life-supporting food below.As a result,female reindeer are becoming starved,causing them to give birth to much lighter young.The average mass of an adult reindeer in 1998,when the survey began,was 55kg,but by 2016 IT had dropped to 48kg.
Professor Steve Albon,an ecologist at the James Hatton Institute in Aberdeen,said that,because the mammals have a relatively high surface-area-to-volume ratio(表面积与体积比),they are no particularly energy efficient.
Reindeer can often access the inadequate food sources beneath the snow by clearing IT away with their antlers(鹿角),but they cannot break through the hard ice.Without access to the food in winter,calves are being born far lighter than they should be.Numbers of reindeer have also increased rapidly in the past 20 years,meaning that those which are born are facing greater competition for food."The implication(含义)are that there may well be more smaller reindeer in the Arctic in the coming decades,but possibly at the risk of catastrophic die-offs because of increased ice on the ground,"said Professor Albon Despite the gloomy findings,reindeer appear to be suffering less from the impact of climate change than some other arctic species.
32.Which of the following may be the most important reason for the smaller reindeer?D
A.Heavy snow.
B.Greater rainfall.
C.Hard ice.
D.Global warming.
33.According to the passage,rising temperatures will not lead toC.
A.grass growing more rapidly in summer
B.more rainfall in the arctic area in winter
C.female reindeer's gaining more weight in winter
D.female reindeer's suffering from hunger in winter
34.What does the underlined word"gloomy"in the last paragraph mean?C
A.Exciting.
B.Optimistic.
C.Disappointing.
D.Doubtful.
35.How does the writer develop the passage?A
A.By analyzing the research.
B.By classification of reindeer.
C.By comparing opinions of experts.
D.By telling stories of different species.
分析 短文主要讲的是全球变暖致使驯鹿体重变小,通过研究来分析这种现象.
解答 32.D,细节理解题,根据句子The reduction in average body-mass is being blamed on global warming.可知,致使驯鹿体重变小是由于全球变暖,故答案为D.
33.C,细节理解题,根据句子scientists will explain how rising temperatures are making female reindeer difficult to obtain nutrients 可知,温度的升高不会让雌性驯鹿在冬天体重增加,故答案为C.
34.C,词义猜测题,根据前面的发现The implication(含义)are that there may well be more smaller reindeer in the Arctic in the coming decades,将来可能会有更多体重变小的驯鹿,可以推测这个发现是"令人失望的",故答案为C.
35.A,推理判断题,短文主要讲的是全球变暖致使驯鹿体重变小,通过研究来分析这种现象,因此短文是通过分析研究得出结果的,故答案为A.
点评 解答任务型阅读理解题,首先对原文材料迅速浏览,掌握全文的主旨大意.因为阅读理解题一般没有标题,所以,速读全文,抓住中心主旨很有必要,在速读的过程中,应尽可能多地捕获信息材料.其次,细读题材,各个击破.掌握全文的大意之后,细细阅读每篇材料后的问题,弄清每题要求后,带着问题,再回到原文中去寻找、捕获有关信息.最后,要善于抓住每段的主题句,阅读时,要有较强的针对性.对于捕获到的信息,要做认真分析,仔细推敲,理解透彻,只有这样,针对题目要求,才能做到稳、准.