Question

16．Time is in the year 2095．It is reported that a comet（彗星） is rushing towards the Earth．Most of it will miss our earth，but two pieces will probably hit the southern half of our planet
On 15 July，a piece about four kilometers wide enters the Earth's atmosphere with a massive explosion（爆炸）．About half of the piece is destroyed，but the remaining part hits the South Atlantic at 200 times the speed of sound．A hole is made in the sea bed．Huge waves spread outwards from the hole．The wall of water，a kilometer high，rushes towards southern Africa at 800 kilometers an hour．Cities on the African coast are totally destroyed and millions of people are drowned．
Before the waves arrive in South America，the second piece of the comet hits Argentina．Earthquakes and volcanoes（火山爆发） are set off in the Andes Mountains．The shock waves move north into California and all around the Pacific Ocean．The cities of Los Angeles，San Francisco and Tokyo are com pletely destroyed by earthquakes．Millions of people in the southern half of the earth are already dead，but the north won't escape for long．Because of the explosions，the sun is hidden by clouds of dust，temperatures around the world fall to almost zero．Crops are destroyed．The sun won't be seen again for many years．Wars break out as countries fight for food．A year later，no more than 10 million people remain alive．
Could it really happen？In fact，it has already happened more than once in the history of the Earth．The dinosaurs were on the Earth for over 160 million years．Then 65 million years ago they suddenly disappeared．Many scientists believe that the Earth was hit by a piece of object in space．The dinosaurs couldn't live through the cold climate that followed and they died out．Will we meet the same end？

42．When the first piece hits the South Atlantic，it causesC．
A．an earthquake       
B．volcanoes    
C．an Earth explosion            
D．huge waves
43．Why can't the northern half of the Earth escape for long？D
A．Because the land is covered with water．
B．Because wars break out among countries for living space．
C．Because people there cannot live at the temperature of zero．
D．Because the light and heat from the sun cannot reach the Earth．
44．By giving the example of dinosaurs，the writer tries to proveC．
A．the human beings will die out  
B．animals could not live in the cold climate
C．the Earth could be hit by other objects in space
D．what happened 65 million years ago was an invented story 
45．Which of the following can be the best title of this passage？B
A．A historic discovery                     
B．An event of imagination
C．A research on space                   
D．A scientific adventure．

Answer 1

分析 本文记叙的是想象的未来发生的一件事情：彗星碎片撞击地球，引起海啸和地震而导致人类遭受毁灭性的打击．

解答 42．C根据原句Huge waves spread outwards from the hole．可以得出，当第一块彗星碎片撞击地球之后，在海床上撞击了一个大洞，并引发汹涌的海浪．故选C．
43．D根据文中原句Because of the explosions，the sun is hidden by clouds of dust，temperatures around the world fall to almost zero．Crops are destroyed．The sun won't be seen again for many years．Wars break out as countries fight for food．A year later，no more than 10 million people remain alive．描述．因为爆炸导致灰尘遮蔽了阳光，全球温度降低到0°左右，农作物被摧毁．为了抢夺食物战争爆发了．可以推出ABC是不符合文意的．故选D．
44．C据文章最后一句话The dinosaurs couldn't live through the cold climate that followed and they died out．Will we meet the same end？可以判断出C正确．
45．B通过阅读全文，我们可以得知，A一个历史性的发现是错误的；C太空探索也是错的；D一个科学大冒险也不对．本篇文章是一篇根据恐龙灭绝的科学推断而想象出的场景．故选B．

点评 本篇文章属于科普性的题材，需要同学们根据文章描述，想象出文中的场景．阅读理解题，需要先阅读题目，带着题目去文中寻找相关的句子，并通过句子推断出正确答案．