Generations of Americans have been brought【C1】______to believe that a good breakfast is important for health. Eating breakfast

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问题    Generations of Americans have been brought【C1】______to believe that a good breakfast is important  for health. Eating breakfast at the【C2】______of the day, we have all been【C3】______,is as necessary as putting gasoline in the family car【C4】______starting a trip.
   But for many people the thought of food first in the morning is by【C5】______pleasures. So【C6】______all the efforts, they still take no【C7】______. Between 1978 and 1983, the latest years for which figures are【C8】______, the number of people who didn’t have breakfast increased【C9】______33 percent—from 8.8 million to 11.7 million【C10】______the Chinese-based Market Research Corporation of America.
   For those who feel pain of【C11】______about not having breakfast,【C12】______, there is some good news. Several studies in the last few years【C13】______that, for adults especially, there may be nothing【C14】______with omitting breakfast. "Going【C15】______breakfast does not affect【C16】______"Said Arnold E. Bendoer, former professor of nutrition at Queen Elizabeth College in London,【C17】______does giving people breakfast improve performance.
【C18】______evidence relating breakfast to better health or【C19】______performances is surprisingly inadequate, and most of the recent work involves children, not【C20】______"The literature," says one researcher, Dr. Ernesto Pollitt at the University of Texas, "is poor."
【C12】

选项 A、however
B、therefore
C、whereas
D、but

答案A

解析 转折句,however,前后都应该有标点符号。
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