Question

17．We already know the fastest，least expensive way to slow climate change：Use less energy．With a little effort，and not much money，most of us could reduce our energy diets by 25percent or more-doing the Earth a favor while also helping our wallets．
Not long age．My wife，PJ，and I tried a new diet-not to lose a little weight but to answer an annoying question about climate change．Scientists have reported recently that the world is bending up even faster than predicted only a few years ago，and that the consequences could be severe if we don't keep reducing emissions（排放）of carbon dioxide（CO2）and other greenhouse gases that are trapping heat in our atmosphere．
We decided to try an experiment．For one month we recorded our personal emissions of CO2..We wanted to see how much we could cut back，so we went on a strict diet．The average US household（家庭）produces about 150pounds of CO2a day by doing common-place things like turning on air-conditioning or driving cars．That's more than twice the European average and almost five times the global average，mostly because Americans drive more and have bigger houses．But how much should we try to reduce？
For an answer，I checked with Tim Flannery，author of The Weather Makers：How Man Is Changing the Climate and What It Means for Life on Earth．In his book，he had challenged readers to make deep cuts in personal emissions to keep the world from reaching extremely important tipping points，such as the melting（融化）of the ice sheets in Greenland or West Antarctica．"To stay below that point，we need to reduce CO2emissions by 80percent，"he said．
Good advice，I thought．I'd opened our bedroom windows to let in the wind．We'd gotten so used to keeping our air-conditioning going around the clock．I'd almost forgotten the windows even opened．We should not let this happen again．It's time for us to change our habits if necessary．

72．Why did the author and his wife try a new diet？B
A．To take special kinds of food
B．To respond to climate change．
C．To lose weight
D．To improve their health
73．The underlined words"tipping points"most probably refer toC
A．freezing points
B．burning points
C．melting points
D．boiling points
74．It can be inferred from the passage thatB
A．it is necessary to keep the air-conditioning on all the time
B．it seems possible for every household to cut emissions of CO2
C．the average US household produces about 3，000pounds of CO2a month
D．the average European household produces about 1，000pounds of CO2a month．
75．Which of the following would be the best title for the passage？
A
A．Saving Energy Starts at Home            
B．Changing Our Habits Begins at Work
C．Changing Climate Sounds Reasonable     
D．Reading Emissions of Proves CO₂ Difficult．

Answer 1

分析 本文主要講述了環(huán)保主題，作者認為每個家庭都可以很容易的通過減少空調(diào)使用等方法節(jié)能減排，我們的環(huán)境最終可以得到改善．

解答 72：B由第二段第一句"Not long age．My wife，PJ，and I tried a new diet-not to lose a little weight but to answer an annoying question about climate change．"可知作者和妻子節(jié)食并不是為了減肥而是為了響應(yīng)環(huán)保節(jié)能的號召，故正確答案為B．
73：C由第四段第二句"…tipping points，such as the melting（融化） of the ice sheets in Greenland or West Antarctica．"可推斷出 tipping points 所指內(nèi)容與冰川融化有關(guān)，故正確答案為C．
74：B 文中作者進行了CO₂減排的嘗試并且呼吁所有人都這么做，而且作者認為美國家庭因為開車太多住房太大所以二氧化碳排放才超標，所以對于他們來說減排是可能的，所以B項符合文意．由最后一段第二句"We'd gotten so used to keeping our air-conditioning going around the clock．I'd almost forgotten the windows even opened．"可知人們不應(yīng)總是開空調(diào)，所以A項錯誤．由"The average US household（家庭） produces about 150 pounds of CO₂a day"可知該數(shù)據(jù)應(yīng)為4500，所以C項錯誤．從文中不能計算出歐洲家庭平均每月排放多少二氧化碳，所以D項錯誤．故正確答案為B．
75：A主旨題．本文主要講述了環(huán)保主題，作者認為每個家庭都可以很容易的通過減少空調(diào)使用等方法節(jié)能減排，結(jié)合選項，所以A項符合文意．

點評 本文是科教類閱讀理解．做這類題材閱讀理解時要求考生對文章通讀一遍，做題時結(jié)合原文和題目有針對性的找出相關(guān)語句進行仔細分析，結(jié)合選項選出正確答案．推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案，切忌胡亂猜測，一定要做到有理有據(jù)．