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简述提高学生复习效果的主要方法。

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日夕策马，候权者之门。

Obesity Causes Global Warming The list of ills attributable to obesity keeps growing: Last week, obese people were accused of causing global warming. This (51) comes from Sheldon Jacobson of the University of Illinois, US, and a doctoral student, Laura McLay. Their study (52) how much extra gasoline is needed to haul fat Americans around. The answer, they say, is a billion gallons of gas per year. It (53) an extra 11 million tons of carbon dioxide. There has been (54) for taxes on junk food in recent years. US economist Martin Schmidt suggests a tax on fast food (55) to people's cars." We tax cigarettes partly because of their health cost," Schmidt said. "Similarly, leading a lazy life style will end (56) costing taxpayers more." US political scientist Eric Oliver said his first instinct was to laugh at these gas and fast food arguments. But such (57) are getting attention. At the US Obesity Society's annual meeting, one person(58) obesity with car accident deaths, and another correlated obesity with suicides. No one asked whether there was really a cause-and-effect relationship. "The funny thing was that everyone took it (59) ." Oliver said. In a 1960s study, children were (60) drawings of children with disabilities and without them, and a drawing of an obese child. They were asked (61) they would want for a friend? The obese child was picked last. Three researchers recently repeated the study (62) college students. Once again, (63) no one, not even obese people, liked the obese person. "Obesity was stigmatized." the researchers said. But, researchers say, getting (64) is not like quitting smoking. People struggle to stop smoking, and, in the end, many succeed. Obesity is different. But, not because obese people don't care. Science has shown that they have limited personal control over their weight. Genes also (65) a part. 51（）

A. study
B. project
C. experiment
D. conclusion

生孩六月，慈父见背。

At the beer-drinking contest the winner drank an average of 10 bottles of beer at the first 20 rounds. After a further 20 rounds the average increased to 15 bottles. What is the average for the last 20 rounds