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1、课时跟踪练（七） Warming Up & Reading Prereading.阅读理解AThe 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 Earths atmosphere
2、 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
3、 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 reach South America, the second piece of the comet lands in Argentina. Earthquakes and volcanoes are set off in the Andes Mountains. The shock wav
4、es 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 wont escape for long. Because of the explosions, the sun is
5、 hidden by clouds of dust, and temperatures around the world fall to almost zero. Crops are ruined. The sun wont 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 happene
6、d more than once in the history of the Earth. The dinosaurs were on the Earth for over 160 million years. Then about 65 million years ago they suddenly disappeared. Many scientists believe that the Earth was hit by a piece of object in space. The dinosaurs couldnt live through the cold climate that
7、followed and they died out. Will we meet the same end?语篇解读：文章主要描述了2094年如果一颗彗星的碎片撞向地球，人类可能面临终结。1What is mainly described in the passage?AA historical discovery.BAn event of imagination.CA research on space.DA scientific adventure.解析：选B细节理解题。根据第一段的时间2094以及下文的内容可知，文章描述了人类在2094年可能会遭遇的灾难。这些事情只是一种想象而已。2Wh
8、en the first piece hits the South Atlantic, it causes _.Aan earthquakeBdamages to citiesCan Earth explosion Dhuge waves解析：选D细节理解题。根据文章第二段中“Huge waves are created and spread outwards from the hole.”可知答案。3Why cant the northern half of the earth escape for long?ABecause the land is covered with water.B
9、Because the light and heat from the sun can not reach the earth.CBecause people there can not live at the temperature of zero.DBecause wars break out among countries.解析：选B推理判断题。文章第三段中提到，南半球的数以百万计的人已经死了，而北半球也逃脱不了这种噩运。因为太阳照不到地球，地球上的温度几乎降到了零度。庄稼遭到了破坏，食物缺乏导致战争的爆发。所以，一切的根源在于B项所提到的事情。4By giving the exampl
10、e of dinosaurs, the author tries to prove _.Aanimals could not live in the cold climateBwhat happened 65 million years ago was an invented storyCthe human beings will die out in 2094Dthe Earth could be hit by other objects in space解析：选D推理判断题。根据最后一段中的“Could it really happen？”以及“Will we meet the same
11、end？”两个问题的提出可知，作者是想通过举恐龙这一例子说明地球很有可能再次遭遇撞击。BThe human brain contains 10 thousand million cells (细胞) and each of these may have a thousand connections. Such great numbers used to discourage us and cause us to stop thinking about the possibility of making a machine with humanlike ability, but now that
12、 we have grown used to moving forward at such a speed we can be less sure. Quite soon, in only 10 or 20 years, perhaps, we will be able to build a machine as complex (复杂的) as the human brain, and if we can we will. It may then take us a long time to make it as intelligent as the human brain by prope
13、rly programming it.I think it is certain that in decades, not centuries, machines of silicon (硅) will arise to compete with their human ancestors. In a real sense they will be able to reproduce themselves. Silicon will have ended carbons long control. And we will no longer be able to consider oursel
14、ves to be the finest intelligence in the world.As the intelligence of robots increases and their cost goes down, we may achieve a lot with their help, first on the earth through their ability to complete any kind of work in harmful environments. In the end, deserts (沙漠) may turn into gardens. Furthe
15、r ahead, by a combination of the great wealth this new age will bring and the technology it will provide, the creation of a huge, manmade world in space, home to thousands or millions of people, will be within our power.语篇解读：本文是一篇议论文。作者主要谈论了机器人可能给人类未来生活带来的改变。5In the authors opinion, the human brain
16、_.Ais complex and intelligentBis too complex to be reproducedCmay change a lot in 10 or 20 yearsDwill soon be replaced by machines解析：选A细节理解题。由第一段中的“as complex (复杂的) as the human brain”和“as intelligent as the human brain”可知，作者认为人类的大脑十分复杂而且非常聪明，故选A项。6The underlined word “carbon” in Paragraph 2 stands for _.Ahuman beingsBan old mac
