【文章內(nèi)容簡介】 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 save the endangered species(物種 ). That’s a move similar to what a Texas A amp。 M University researchers have been undertaking for the past five years in a project called “Noah’s Ark”. Noah’s Ark is aimed at collecting eggs, embryos(胚胎 ), semen and DNA of endangered animals and storing them in liquid nitrogen. If certain species should bee extinct, Dr. Duane Kraemer, a professor in Texas A amp。 M’s College of Veterinary Medicine, says there would be enough of the basic building blocks to reintroduce the species in the future. It is estimated that as many as 2, 000 species of mammals, birds reptiles will bee extinct in over 100 years. The panda, native only to China, is in danger of being extinct in the next 25 years. This week, Chinese scientists said they grew an embryo by introducing cells from a dead female panda into the egg cells of a Japanese white rabbit. The