D
The year is 2094. It has been announced that a comet (彗星) is heading towards the Earth . Most of it will miss our planet , but two pieces will probably hit the southern half of the Earth .
On 17 July , a piece four kilometers wide enters the Earth’s atmosphere (大气层) with a massive explosion . About half of the piece is destroyed , but the remaining part hits the South Atlantic at 200 times the speed of sound . The sea boils and a huge hole is made in the sea bed . Huge waves are created and 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 re drowned .
Before the waves reach South America , the second piece of the comet lands in Argentina . Earthquakes and volcanoes 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 completely 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 ruined . 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 ?
小题1:What is mainly described in the passage ?
A．A historic discovery .
B．An event of imagination
C．A research on space .
D．A scientific adventure .小题2:When the first piece hits the South Atlantic , it causes .
A．an earthquake
B．damages to cities
C．an Earth explosion
D．huge waves小题3:Why can’t the northern half of the earth escape for long ?
A．Because the land is covered with water
B．Because the light and heat from the sun can not reach the earth .
C．Because people there can not live at the temperature of zero .
D．Because wars break out among countries .
小题1:B
小题2:D
小题3:B
题目分析：这是一篇科普文章，是作者对若干年后人类可能会面临的灾难进行假想。
小题1:B此题属于主旨概括题。这是一篇科普文章，通读全文，可看出作者是对若干年后人类可能会面临的灾难进行假想。答案为B。
小题1:D此题属于细节理解题。答案在第二段中“The sea boils and a huge hole is made in the sea bed. Huge waves are created...”最接近的答案应为D。
小题1:B此题属于细节理解题。答案显然在第三段“Because of the explosions，the sun is hidden by clouds of dust，temperatures around the world fall to almost zero...The sun won’t be seen again for many years. ”B符合题意。
点评：在阅读之前，先阅读问题，带着问题有针对性的去阅读文章。阅读注意事项：1、关注连词，分析文章逻辑结构。2、聚焦代词，明辨指代关系。3、抓住关键词语，利用平行结构、上下文（包括定义、释义、举例、对比、标点）进行判断与推理。4、了解一些构词法，从词根的特殊含义入手。