【正文】 evealed that paction of the sandy arid soil resulting from the passage of just one motorcycle markedly reduced the infiltration ability of the soil and created a stream of rain runoff water that eroded the hillside surface. In addition, the researchers discovered that the soil paction cause by the offroad vehicles often killed native plants species and resulted in the invasion of different plant species within a few years. The native perennial species required many more years before they showed signs of returning. The scientists calculated that roughly a century would be required for the infiltration capacity of the Mojave soil to be restored after being pared by vehicles. 39. According to text, what is being damaged? A. Motorcycles. B. The desert landscape. C. Roads through the desert. D. New plant species. 40. According to the text, what is happening to native plants in these areas? A. They are being more pact. B. They are adapting. C. They are invading other areas. D. They are dying. TEXT C Without regular supplies of some hormones our capacity to behave would be seriously impaired。s changing sensitivity to some hormones are essential aspects of the phenomena of aging. Communication within the body and the consequent integration of behavior were considered the exclusive province of the nervous system up to the beginning of the present century. The emergence of endocrinology as a separate discipline can probably be traced to the experiments of Bayliss and Starling on the hormone secretion. This substance is secreted from cell in the intestinal walls when food enters the stomach。s age. D. The short child of tall parents very likely had a hormone deficiency early in life. 44. According to the text, another term for exocrine glands is _______. A. duct glands B. endocrine glands C. ductless glands D. intestinal glands TEXT D To get a chocolate out of a box requires a considerable amount of unpacking。 and now, with massive increases in paper prices, the time has e at which collection by local authorities could be profitable. Recycling of this kind is already happening with milk bottles, which are returned to the dairies, washed out, and refilled. But both glass and paper are being threatened by the growing use of plastic. More and more dairies are experimenting with plastic bottles, and British dairies would be producing the equivalent of enough plastic tubing to encircle the earth every five or six days! The trouble with plastic is that it does not rot. Some environmentalists argue that only solution to the problem of ever growing mounds of plastic containers is to do away with plastic altogether in the shops, a suggestion unacceptable to many manufacturers who say there is no alternative to their handy plastic packs. It is evident that more research is needed into the recovery and reuse of various material and into the cost of collecting and recycling containers as opposed to producing new ones. Unnecessary packaging, intended to be used just once, and making things look better so more people will guy them, is clearly being increasingly absurd. But it is not so much a question of doing away with packaging as using it sensibly. What is needed now is a more unimportant function. 45. The local authorities are ________. A. the Town council B. the police C. the paper manufacturer D. the most influential citizens 46. If paper is to be recycled ________. A. more forests will have to be planted B. the use of paper bags will have to be restricted C. people will have to use different dustbins for their rubbish D. the local authorities will have to reduce the price of paper 47. The environmentalists think that ________. A. more plastic packaging should be used B. plastic is the most convenient form of packaging C. too much plastic is wasted D. shops should stop using plastic containers TEXT E For me, scientific knowledge is divided into mathematical sciences, natural sciences or sciences dealing with the natural world (physical and biological sciences), and sciences dealing with mankind (psychology, sociology, all the sciences of cultural achievements, every kind of historical knowledge). Apart from these sciences is philosophy, about which we will talk later. In the first place, all this is pure or theoretical knowledge, sought only for the purpose of understanding, in order to fulfill the need to understand that is intrinsic and consubstantial to man. What distinguishes man from animal is that he knows and needs to know. If man did not know that the world existed, and that the world was of a certain kind, that he was in the world and that he himself was of a certain kind, he wouldn39。s diversity by juxtaposing forms with rounded and angular shapes to suggest specific elements of the urban landscape: skyscrapers, flashing lights, and hurrying people. TEXT G First read the following questions. 52. According to the first advertisement, anyone who ________ would receive ten shillings. A. found the umbrella B. gave a message C. left the umbrella at No. 10 Broad Street D. left the umbrella in the City Church 53. This is a story about ________. A. a useless advertisement B. how to make an effective advertisement C. how the man lost and found his umbrella owner D. what the merchant did for the umbrella owner Now read the text quickly and answer questions 33 and 34. A man once said how useless it was to put advertisements in the newspapers. Last week, said he, my umbrella was stolen from a London church. As it was a present ,I spent twice its worth in advertising, but I didn39。100,000 prize by Henry Kremer, a British industrialist, for the first successful nonstop humanpowered flight across the English Channel. Allen and McCready were no strangers to humanpower flight. They and the American team had previously won the 39