题目内容
9.Around the world,a lot of fresh water basins lie underground.These groundwater basins are like banks.Now,changes in climate and human water usage are emptying those groundwater basins,a new study finds.And it's happening at a worrying rate.Of Earth's 37largest groundwater basins,21of them lose more water each year than they gain.The conclusion is troubling.That's according to the study coauthor Sasha Richey.About 2billion people drink water from underground water basins.Crops also need such water to grow.People get groundwater by drilling into groundwater basins called aquifers(储水层).Aquifers are refilled when water goes down through the soil.Scientists can know about groundwater through wells.Water levels drop as an aquifer becomes empty.This method fails to provide a global picture of changes in water levels,though.
Richey and her colleagues used data collected by the GRACE mission instead.Theses win satellites measure small changes in Earth's gravity.Changes in the density(密度) of Earth's surface cause those small changes in gravity.The emptying and refilling of groundwater basins is one way that the density of Earth's surface changes.The GRACE satellites pass over these buried basins regularly.As they do,the satellites"weigh"the mass of the water stored inside.
The researchers examined gravity changes over Earth's largest aquifers in the past ten years.Eight of the studied aquifers lost great volumes of water over that decade.The researchers considered these aquifers as"overstressed".That means almost no water naturally went in to supersede the water being taken out.The regions of greatest concern were in the Middle East,northern Africa and northwestern India and Pakistan.
The most dried-up aquifers were in areas near large cities,in heavily agricultural areas or in dry areas.All three characteristics probably led to the extreme stress affecting the basins below central California,Richey says.California has both people and farms.It's also in a sever drought.As a result,the state's pumping of groundwater recently has greatly increased.
32.What can we learn from the finding of the new study?D
A.There are 37large groundwater basins in the world in all
B.Most of the world's groundwater basins are empty
C.Men are cautious about using underground water
D.Climate change is shrinking underground water
33.To learn about the current situation of groundwater basins,Richey and her colleaguesC.
A.collected data of aquifers around the world
B.used two satellites to study the effect of climate change
C.referred to the data about changes in Earth's gravity
D.observed the buried groundwater basins frequently
34.What does the underlined word"supersede"in Paragraph 4mean?A
A.Replace
B.Increase
C.Improve
D.Support
35.We can learn from the last paragraph that in California a lot of peopleC.
A.go to central California for water
B.don't know the importance of groundwater
C.depend on groundwater for their daily activities
D.are aware they're harming groundwater basins.
分析 本文是一篇科教类阅读,主要介绍了地下水的减少及科学家对地下储水层的一些研究.
解答 32-35.DCAC
32题答案:D考查细节推理,根据第一段的Now,changes in climate and human water usage are emptying those groundwater basins,a new study finds.一项新的研究发现气候的改变和人类对水的使用使这些地下盆地变空.可知本题答案为D选项"气候变化使地下水缩减".
33题答案:C考查细节推理,根据文章第三段的Richey and her colleagues used data collected by the GRACE mission instead.Theses win satellites measure small changes in Earth's gravity.Richey和她的同事使用GRACE任务所收集的数据,这些获胜卫星测量地球重力的微弱变化.可知本题答案为C选项.
34题答案:A考查细节推理,结合前面一句The researchers considered these aquifers as"overstressed"."研究者认为这些储水层压力过大"可知后面一句话的意思是"那意味着没有水能自然进入从而代替被取出的水",故本题答案为A选项.
35题答案:C考查细节推理,根据最后一句As a result,the state's pumping of groundwater recently has greatly increased.因此美国加州地下水的抽取近期大幅增加.可知本题答案为C选项"日常生活依靠地下水".
点评 本文是一篇科教类阅读,题目涉及多道细节理解题,做题时结合原文和题目有针对 性找出相关语句进行仔细分析,结合选项选出正确答案.推理判断也是要在抓住关键句子的基础上合理的分析才能得出正确的答案.