high, rushes towards southern Africa at 800 kilometres an

　　hour. Cities on the African coast are totally destroyed and mil lions 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 waves move north

　　into California and all around the Pacific Ocean. The cities of lob 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 (恐龙) were on the Earth for over 160 million years. Then 65 mil- lion 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?

　　1. What is mainly described in the passage？

　　A. A historic discovery

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