【正文】 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 are drowned. Before the waves reach South America, the second piece of the et 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 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 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? 36． 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. 37． When the first piece hits the South Atlantic, it causes . A． an earthquake B． damages to cities C． an Earth explosion D． huge waves 38． 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 . 39． By giving the example of dinosaurs, the author tries to prove . A． animals could not live in the cold climate B． what happened 65 million years ago was an invented story C． the human beings will die out in 2094 D． the Earth could be hit by other objects in space B We often think of future. We often wonder what the world would be like in a hundred years’ time . Think of space， perhaps a permanent(永久的 ) station on the moon will have been set up. Perhaps people will be able to visit the moon as tourists. Cheap rockets for space travel will have been developed， permitting long journeys throughout the solar system(太陽(yáng)系 ). When that time es， people will be taking holidays in space and visiting other plas. Great progress will have been made in medicine， too. Perhaps a cure will have been discovered for the most terrible of all diseases— cancer. Pollution is a problem we must solve. In hundred’s years’ time it will have been controlled . All the world will have been developed — even Antarctica. There will be large cities in Antarctica. We already have supersonic(超音速的 ) flight， but in a hundred years’ time we will have supersonic land travel as well. We will have used up most of earth’s land to build our cities ， so floating cities will have been built. The Japanese already have plans for cities of this kind. And there will be cities under the sea. The first of these will have been pleted. 40. We will have developed ______ in a hundred years’ time， permitting long journeys all over the solar system. A. cheap rockets for space travel B. a plane C. a spaceship D. a satellite 41. Man will also have supersonic land travel ______ . A. in a year B. about half a century later C. in the year 2050 D. about a century later 42. The last paragraph mainly talks about ______ . A. we’ll make good use of space on the earth B. cities under the sea C. Japan will first build floating cities D. earth’s land is in danger 43. The best title for the passage is ______ . A. Travel in the Future B. Future Life C. Where to Live in the Future D. Space Travel C Some people are pessimistic(悲觀的 ) when they think about the future. They say that， a hundred years from now， we will have used most of the earth’s resources . We will have polluted our seas badly， and be unable to eat fish from the