【正文】 out the orbits of some of the ets that had been observed by scientist. He made a surprising discovery. The ets that had appeared in the years 1531, 1607 and 1682 all had the same orbit. Yet their appearances had been 75 to 76 years apart. This seemed very strange to Halley. Three different ets followed the same orbit. The more Halley thought about it, the more he thought that there had not been three different ets, as people thought. He decided that they had simply seen the same et three times. The et had gone away and had e back again. It was an astonishing idea! Halley felt certain enough to make a prediction of what would happen in the future. He decided that this et would appear in the year 1758. There were 53 years to go before Halley’s prediction could be tested. In 1758 the et appeared in the sky. Halley did not see it, for he had died some years before. Ever since then that et been called Halley’s et, in his honor. 60. Halley made his discovery ______. A. by doing experiments B. by means of his own careful observation C. by using the work of other scientists D. by chance 61. Halley made a surprising but correct prediction in the year ________. C. 1706 62. This text in general is about _______. A. Halley and other scientists B. the orbit of a et C. Newton and Halley D. Halley and Halley 63. Which of the following is TRUE? A. Edmund Halley was an American scientist. B. Halley made his discovery by doing experiments. C. Isaac Newton was a famous mathematician. D. The orbit of a et had the shape of an around. C Millions of years ago dinosaurs lived on the earth. In the days of dinosaurs, the whole earth was warm and wet. There were green forests and they could find enough to eat. Later, parts of the earth became cold and dry, and the forests there died. Then dinosaurs could not find enough to eat. This must be one reason why dinosaurs died out. We can guess another reason. New kinds of animals came on the earth. Some had big brains and strong .They could kill dinosaurs. There may be other reasons that we don’t know about yet. Scientists are are trying to make more discoveries about dinosaurs. Dinosaurs were of many sizes and shapes. Some were as small as chickens, while some were about 90 feet long. There were also terrible rights between dinosaurs. They night have happened more than 100 million years ago. Though there was no man to see any of the fights, we can be told by the animal’s footprints(足跡 )that fights did take place . 64. According to the passage, dinosaurs did exist only on the earth _______. A. for millions of year B. millions of years ago C. more than 100 million years ago D. when it was warm and wet somewhere 65. One reason why dinosaurs died out is that __________. A. there were too many dinosaurs B. parts of the earth became cold and dry C. the dead forests there could not supply them with enough food D. they couldn’t find enough go eat 66. One more reason why dinosaurs died out may be that _______. A. new kinds of animals came on the earth B. some fast and strong animals with big brains could kill them C. some dinosaurs were as small as chickens D. some big dinosaurs died in the fights 67. We can see from this passage ________. A. scientists are trying to make some dinosaurs B. dinosaurs are dangerous enough C. dinosaurs are worth studying D. scientists know nothing about dinosaurs D The blue tits(山雀 ) have been inspecting the nestbox again this year. The male is the househunter but the female will make the final choice. He lands at the hole and turns his head to expose his white cheeks as a signal to attract the female from where she has been feeding. Among many birds that nest in holes, the male has a lightcoloured patch on its plumage(鳥羽 ) which acts as signal for drawing the female’s attention to a suitable nestingplace. Unlike the blue tit, the redstart(紅尾鴝 ) may be only the male that strikingly coloured and the female is not beautiful. A few years ago I was lucky enough to spot a pair of redstarts in action in a Walsh wood. The male was leading an interested female to holes that he had previously(先前 ) checked out. He sat at the entrance of each hole and put his head on to show off his white forehead, or his head in to reveal(顯露 ) his tail. If the female failed to react to his visual signals, the male sometimes sang for extra effect, while gliding towards her on spread wings and tail. Once the female accepts by following the male through the hole the displays stop, you must be at the right place at the right time to watch them. 68 How do the blue tits choose their nest? A. They choose their nest together. B. The male chooses their nest. C. The househunter chooses their nest. D. The female chooses their nest. 69. The writer was lucky to see ________. A. how the male made his tricks B. how an interested female played with the male happily C. what the male displayed and won the female D. that the male tried his best but failed to attract the female 70. You can spot a pair of redstarts in a Walsh wood ________. A. at any time B. regularly C. in April D. occasionally 71. The writer is probably ________. A. a bird expert B. a birdhunter C. a bird raiser D. a scientist E With only about 1, 000 pandas left in the world, China is desperately trying to clone(克隆 ) the animal and s