Question

5．In the past 200 years，the earth's temperature has increased greatly．It's reported that a marked increase in the temperature of about 0.7°c appeared at the end of last century．some scientists think  mini-umbrellas（微型傘） might reduce the global（全球的） temperature．
     Building a single umbrella，which is big enough to cover the whole earth，seems to be impossible roger angle，a scientist from the usa，has carried out research to deal with this problem．he came up with an idea of mini-umbrella．in fact，each mini-umbrella is made up of two parts，a spaceship and a sunshade（遮陽蓬）．a(chǎn) spaceship weighing about 1g  would carry a sunshade that is half a meter long．it would be mostly transparent．  that means light can  pass it directly to reach the earth，with lands and oceans clearly in view．
    Pressure（壓力） from the sunlight would keep the little spaceships in position around the earth at a distance of about 1.5 million kilometers．a(chǎn)s a result，sending over 1，000 billion mini-umbrellas  space would reduce the amount of sunlight reaching the earth．this allows sunlight to be reflected（反射） back to space easily，causing the temperature of the earth's ground to fall off．covering large areas of the earth，mini-umbrella together could reflect 1.8 percent of sunlight back，i roger's plan，scientists will send up 800，000 mini-umbrellas at a time，20 million times in all during ten years．scientists suggest the earliest launch could be in just 16 years．
    Not all the scientists agree with the idea．some suppose there should be easier and much cheaper ways to prevent the earth from getting too hot，such as to slow down the pollution people bring and to reduce the human activities．whatever the result of the argument is，this idea of mini-umbrellas in space is certainly creative．
根據(jù)短文內(nèi)容選擇最佳答案．
46．the underlined word"transparent"here probably means"A"．
a．透明的   b．透氣的  c．透風(fēng)的
47．PictureCshows the right information about the mini-umbrella．

48．After scientists send over 1，000 billion mini-umbrellas a into space，B．
A．pressure from the sunlight would allow the mini-umbrellas to be reflected back to space easily
B．the mini-umbrellas would reduce the amount of sunlight reaching the earth
C．sunlight would never come into the earth
49．Which of the following is NOT true according to the passage？C
A．Scientists suggest that the earliest launch could be in just 16 years．
B．A spaceship weighing about 1g would carry a sunshade．
C．Roger will send up 800，000 mini-umbrellas into space during 20 years．
50．The best title for this passage should beB．
A．THE TEMPERATURE OF THE EARTH
B．A MINI-UMBRELLA PLAN
C．CHEAPER WAYS TO PREVENT THE POLLUTION．

Answer 1

分析 短文講了地球的溫度不斷的升高，科學(xué)家想辦法降低地球的溫度，他們做了一個微型傘的計劃來降低地球的溫度．

解答 答案：46．A    詞義猜測題．根據(jù)上下句a spaceship weighing about 1g would carry a sunshade that is half a meter long．it would be mostly transparent． that means light can pass it directly to reach the earth，重量1克左右的飛船將攜帶一個遮陽傘，有半米長，都是…，光線可以通過它直接射到地球上，可知光線可以通過它直接射到地球上，所以transparent意為透明的．故選A．
47．C    細(xì)節(jié)推理題．根據(jù)第二段最后一行句子that means light can pass it directly to reach the earth，with lands and oceans clearly in view．這意味著光可以直接通過它到達(dá)地球，陸地和海洋清晰可見．和第三段第二行句子this allows sunlight to be reflected（反射） back to space easily，causing the temperature of the earth's ground to fall off．這使得陽光很容易被反射回太空，導(dǎo)致地球的溫度下降．可知結(jié)合選項，故選C．
48．B   細(xì)節(jié)理解題．根據(jù)第三段第一行句子as a result，sending over 1，000 billion mini-umbrellas space would reduce the amount of sunlight reaching the earth．this allows sunlight to be reflected（反射） back to space easily，causing the temperature of the earth's ground to fall off．結(jié)果，發(fā)送微型傘超過1萬億遠(yuǎn)的太空會減少太陽光到達(dá)地球，這使得陽光很容易被反射回太空，導(dǎo)致地球的溫度下降．可知 mini-umbrell會減少到達(dá)地球的太陽光．故選B．
49．C   細(xì)節(jié)判斷題．根據(jù)第三段第三行句子scientists will send up 800，000 mini-umbrellas at a time，20 million times in all during ten years．科學(xué)家將發(fā)送800，000
mini-umbrellas，十年間兩億次．可知不是二十年．故選C．
50．B   主旨?xì)w納題．根據(jù)整篇文章內(nèi)容及其第一段第一行句子some scientists think mini-umbrellas（微型傘） might reduce the global（全球的） temperature．一些科學(xué)家最后認(rèn)為微型傘可能降低全球溫度．可知這篇文章介紹的都是微型傘，即微型傘計劃，故選B．

點評 在通讀全文的基礎(chǔ)上，根據(jù)全文大意，展開邏輯思維，瞻前顧后，認(rèn)真觀察選項，仔細(xì)推敲，確定最佳答案．