【正文】 rmer because of their _________. A. deep color B. round shape C. enormous size D. high reflectivity70. Dr Bala39。60m worth of trees have been bought this year, up from 163。s model suggests that plete deforestation would cause an additional ??C temperature rise pared with business as usual, because of the higher carbondioxide levels that would result. However, the additional reflectivity of the planet would cause ??C of cooling. A treeless world would thus be ??C cooler than otherwise. No one, of course, would consider chopping down the world39。s temperature by means other than the carbon they take in. For instance forests remain quite a dark shade even after a snowstorm. They are certainly darker than grasslands, and thus they can absorb more of the sun39。t want to spend their money on useless thingsD. spending money gives them pain68. The passage mainly tells us_________. A. how to spend our money B. it is better to save some money for the future C. it is the chemicals released from the brain that decide our spending D. how to form a habit of rational spendingPassage Four Trees are good. Good enough to hug. Planting trees will make the world cooler than it would otherwise be. This is the subject of a newly published study by Govindasamy Bala, of the Lawrence Livermore National Laboratory, in California, and his colleagues. Dr Bala has found, rather counterintuitively, that removing all of the world39。t pay back their debts on time66. According to the resent studies made by economists, people__________. A. take pleasure in buying useless things B. won39。t buy things that they need. In a recent series of experiments, scientists at Stanford University in the US confirmed something that many people have long suspected. People spend money because the act of buying gives them pleasure. And they refuse to spend when it causes them pain. The scientists discovered that different areas of the brain that anticipate pleasure and pain bee more active when we are making a decision to buy things. People who spend a lot have their pleasure centers stimulated. People who like to save find buying things painful. If you think you really want that product because it39。t have to pay them as much. But you want everybody else to spend all the money they can. That way you make bigger profits. It39。s nice to have a fortable life right now, but it is best to think of the future. Yet economists have long known that things don39。 burning of fossil fuel D. increasing levels of carbon dioxide59. The word upbeat (in Paragraph 3) probably means __________. A. pessimistic B. optimistic C. worried D. insensible60. What does Ally suggest people do in order to reduce global warming? A. To find other energy sources besides fossil fuels. B. To start a political, scientific and economic debate. C. To take action to burn no fossil fuels. D. To call on people worldwide to protect our earth.61. Alley predicts that global warming could turn Europe and parts of eastern North America into ______. A. a region like Siberia B. a warmer and warmer place C. a tropical region D. a place like North Pole62. Ally thinks the biggest problem in the world is A. lack of harmony B. violence C. global warming D. climate shiftPassage Three We39。re not getting along with the planet, Alley said.57. According to Ally the climate threats to the earth brought by global warming _________. A. can be eased B. can be ended C. will bee worse D. will last for decades58. Ally39。s part of that because we39。s research shows. A gradual change in atmospheric temperature, such as global warming, could push the climate to a threshold where such a shift suddenly occurs, he said. Alley told his audience of about 200 people in a University of Vermont lecture hall Wednesday evening that he couldn39。t it be useful if the United States were to have a piece of the action. Wouldn39。t walk behind smokers. Walk on the windward side of the street where exposure to pollutants can be 50 percent less than on the downwind side.Sitting on the driver39。s curriculum did not provide enough choice and encourage premature specialization. Harvard needs to 43 its education for a world where global connections, cross disciplinary research, and science in general are ever more important, said Kirby. Particularly 44 is the idea that students need to spend time overseas, either in a traditional studyabroad program or over a summer, perhaps doing an internship or research. Students can either find the program themselves or 45 some exchange programs offered by the university. 46 studying Chinese history without leaving the university, students interested in the subject should be spending a semester at a university in China. It was also remended that Harvard 47 its required core curriculum. The core curriculum was an effort created in 1978 to broaden education by requiring students to choose from a list of courses in several areas of study. Classes often focused on a highly 48 topic and emphasized ways of knowing. Under a new plan, the curriculum would be replaced with a set of 49 Harvard College Courses, emphasizing knowledge over methodology and 50 wider territory. A life sciences course, for example, might bine molecular and evolutionary biology and psychology, rather than focusing on one of those, said Benedict Gross, Harvard College dean.41. A. inspecting B. reviewing C. searchingD. underlying42. A. in accordance with B. in line with C. in charge ofD. in response to43. A. update B. uphold C. upsetD. upward44. A. trustworthy B. noteworthy C. praiseworthyD. rewardworthy45. A. turn out B. turn in