【文章內(nèi)容簡介】 imum effort helps save one’s energy.[b] n explains why people reach their peaks at different hours of day.[c] habit helps a person adapt to his own energy cycle.[d] children have energy cycles, 3there was one thought that air pollution affected only the area immediately around large cities with factories and heavy automobile present, we realize that although these are the areas with the worst air pollution, the problem is literally several occasions over the past decade, a heavy cloud of air pollution has covered the east of the united states and brought health warnings in rural areas away from any major concentration of manufacturing and automobile fact, the very climate of the entire earth may be infected by air scientists consider that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels（coal and oil）is creating a “greenhouse effect”— conserving heat reflected from the earth and raising the world39。s average this view is correct and the world39。s temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as new york, boston, miami, and new orleans will be in r view, less widely held, is that increasing particular matter in the atmosphere is blocking sunlight and lowering the earth39。s temperature — a result that would be equally drop of just a few degrees could create something close to a new ice age, and would mane agriculture difficult or impossible in many of our top farming we do not know for sure that either of these conditions will happen（though one recent government report drafted by experts in the field concluded that the greenhouse effect is very possible）perhaps, if we are lucky enough, the two tendencies will offset each other and the world39。s temperature will stay about the same as it is by economic profits, people neglect the damage on our environment caused by the “advanced civilization”.maybe the air pollution is the price the human beings have to pay for their is it really worthwhile?pointed out at the beginning of the passage, people used to think that air pollution _______.[ a ] cause widespread damage in the countryside[ b ] affected the entire eastern half of the united states[ c ] had damaged effect on health[ d ] existed merely in urban and industries areasto the greenhouse effect, the author __________.[ a ] share the same view with the scientist.[ b ] is uncertain of its occurrence [ c ] rejects it as being ungrounded [ d ] thinks that it will destroy the world soonword “offset” in the second paragraph could be replaced by _________.[ a] slip into [ b ] make up for[ c ] set up [ d ] catch up withcan be concluded that ____________.[ a ] raising the world39。s temperature only a few degrees would not do much harm to life on earth.[ b] lowering the world39。s temperature merely a few degrees would lead major farming areas to disaster.[c] almost no temperature variations have occurred over the past decade.[d] the world39。s temperature will remain constant in the years to passage is primarily about __________.[a]the greenhouse effect?? [ b ] the burning of fossil fuels?? [c] the potential effect of air pollution.[ d] the likelihood of a new ice b directions: read the following article in which five people talk about their ideas of questions 61 to 65 ,match name of each speaker to one of the statements（a to c）given your answers on your answer you can always recognize dieters from the sour expression on their spend most of their time turning their noses up at are forever consulting calorie charts, gazing at themselves in mirrors, and leaping on to weighingmachines in the spend a lifetime fighting a losing battle against spreading hips, protruding tummies and double a miserable lot dieters are!marlini began making some dietary and lifestyles changes during my second year of college and have been eating this way ever like the way i feel when i don39。t eat animal foods so much more than the pleasure i used to get from eating have much more energy。i need less sleep。i feel calmer。i can maintain an ideal body weight without worrying about how much i eat, and i can think more during my first year of college, i gained forty pounds when i began throwing the the next twenty years, i carried all of this extra weight