【正文】 cultivated crops. From then on, humans would increasingly take their living from the controlled production of a few plants, rather than getting a little here and a little there from many varieties that grew wild—and the accumulated knowledge of tens of thousands of years of experience and intimacy with plants in the wild would begin to fade away. 36. Which of the following assumptions about early humans is expressed in the passage？ A. They divided knowledge into several fields. B. They probably had extensive knowledge of plants. C. They knew little about the environment they were living in. D. They invented the term ―botany‖ but had no idea of what it was about. 37. The phrase ―properties of each‖ in paragraph 1 refers to the properties of ____. A. each tribe B. each jungle C. each plant D. each purpose 38. The author mentions ―a rose, an apple, or an orchid‖ in paragraph 2 to ____ . A. make the passage more poetic B. test the reader‘s knowledge C. illustrate the diversity of botanical life D. give botanical examples that most readers will recognize 39. According to the passage, why has general knowledge of botany declined？ A. Industrialization has spoiled the natural environment. B. Botany is no longer regarded as a special branch of science. C. Research is unable to keep up with the increasing number of plants. 第 6 頁 共 12 頁 D. Direct contact with a variety of plants has decreased. 40. According to the passage， what was the first great step taken toward agriculture？ A. The invention of agricultural machinery. B. The production of a controlled number of plants. C. The discovery of certain grasses that could be harvested and replanted. D. The close relationship between human beings and plants. Passage Three Cancer is feared by everyone. And this fear is reaching epidemic(流行性 ) proportions. Not the disease itself — there is no such thing as a cancer epidemic. Except for lung cancer, mostly caused by cigarette smoking ,the incidence rates are leveling off, and in the case of some kinds of cancer are decreasing. But the fear of cancer is catching, and the country stands at risk of an anxiety, the earth itself is ing to seem like a huge carcinogen(致癌物 ). The ordinary, more or less scientific statement that something between 80 and 90 percent of all cancers are dun to things in the environment is taken to mean that none of us will be safe until the whole environment is ―cleaned up.‖ This is not at all the meaning. The 80percent calculation is based on the unthinkable differences in the incidence of cancer in various societies around the world — for example, the high proportion of liver cancer in Africa and the Far East, stomach cancer in Japan, breast cancer in Western Europe and North America, and the relatively low figures for breast cancer in Japan and parts of Africa and for liver cancer in America. These data indicate there may be special and specific environmental influences, largely based on personal lifestyle, that determine the incidence of various forms of cancer in different munities — but that is all the data suggest. The overall incidence of cancer, counting up all the cases, is probable roughly the same everywhere. of the following is closest to meaning to the phrase ―leveling off‖? A. Became very popular B. Reached its lowest level in popularity C. Stopped being popular D. Stopped increasing its popularity 42. According to the passage, the incidence of cancer is generally believed _____. A. to be based on inactive life style B. to be due to anxiety C. to result from environmental influences D. to be caused by heavy smoking 43. It can be inferred from the passage that the writer‘s opinion about the relationship between cancer and environment is_____. A. positive B. negative C. neutral D. approving 44. According to the passage, the writer seems to feel that_____. A. cancer risk is on the rise B. the whole earth resembles a huge carcinoge