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（火山爆發(fā)） 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．a(chǎn)n earthquake       
B．volcanoes    
C．a(chǎn)n 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．a(chǎn)nimals 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 本文記敘的是想象的未來(lái)發(fā)生的一件事情：彗星碎片撞擊地球，引起海嘯和地震而導(dǎo)致人類遭受毀滅性的打擊．

解答 42．C根據(jù)原句Huge waves spread outwards from the hole．可以得出，當(dāng)?shù)谝粔K彗星碎片撞擊地球之后，在海床上撞擊了一個(gè)大洞，并引發(fā)洶涌的海浪．故選C．
43．D根據(jù)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?yàn)楸�炸�?dǎo)致灰塵遮蔽了陽(yáng)光，全球溫度降低到0°左右，農(nóng)作物被摧毀．為了搶奪食物戰(zhàn)爭(zhēng)爆發(fā)了．可以推出ABC是不符合文意的．故選D．
44．C據(jù)文章最后一句話The dinosaurs couldn't live through the cold climate that followed and they died out．Will we meet the same end？可以判斷出C正確．
45．B通過(guò)閱讀全文，我們可以得知，A一個(gè)歷史性的發(fā)現(xiàn)是錯(cuò)誤的；C太空探索也是錯(cuò)的；D一個(gè)科學(xué)大冒險(xiǎn)也不對(duì)．本篇文章是一篇根據(jù)恐龍滅絕的科學(xué)推斷而想象出的場(chǎng)景．故選B．

點(diǎn)評(píng) 本篇文章屬于科普性的題材，需要同學(xué)們根據(jù)文章描述，想象出文中的場(chǎng)景．閱讀理解題，需要先閱讀題目，帶著題目去文中尋找相關(guān)的句子，并通過(guò)句子推斷出正確答案．