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（微型伞） 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（遮阳蓬）．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，with lands and oceans clearly in view．
    Pressure（压力） from the sunlight would keep the little spaceships in position around the earth at a distance of about 1.5 million kilometers．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．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．
根据短文内容选择最佳答案．
46．the underlined word"transparent"here probably means"A"．
a．透明的   b．透气的  c．透风的
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 短文讲了地球的温度不断的升高，科学家想办法降低地球的温度，他们做了一个微型伞的计划来降低地球的温度．

解答 答案：46．A    词义猜测题．根据上下句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克左右的飞船将携带一个遮阳伞，有半米长，都是…，光线可以通过它直接射到地球上，可知光线可以通过它直接射到地球上，所以transparent意为透明的．故选A．
47．C    细节推理题．根据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．这意味着光可以直接通过它到达地球，陆地和海洋清晰可见．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．这使得阳光很容易被反射回太空，导致地球的温度下降．可知结合选项，故选C．
48．B   细节理解题．根据第三段第一行句子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．结果，发送微型伞超过1万亿远的太空会减少太阳光到达地球，这使得阳光很容易被反射回太空，导致地球的温度下降．可知 mini-umbrell会减少到达地球的太阳光．故选B．
49．C   细节判断题．根据第三段第三行句子scientists will send up 800，000 mini-umbrellas at a time，20 million times in all during ten years．科学家将发送800，000
mini-umbrellas，十年间两亿次．可知不是二十年．故选C．
50．B   主旨归纳题．根据整篇文章内容及其第一段第一行句子some scientists think mini-umbrellas（微型伞） might reduce the global（全球的） temperature．一些科学家最后认为微型伞可能降低全球温度．可知这篇文章介绍的都是微型伞，即微型伞计划，故选B．

点评 在通读全文的基础上，根据全文大意，展开逻辑思维，瞻前顾后，认真观察选项，仔细推敲，确定最佳答案．