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

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

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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】______pleasure. So【C6】______all the efforts, they still take no【C7】______. Between 1978 and 1983, the latest year 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】______performance 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，前半部分为状语，后半句为主句，此四项中引导转折句的只有A、D两项，但D项but引导的前后两部分，结构上应为平行结构。
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