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  3. In April, British researchers at University College London found that, rather than the recommended five, seven daily portions of

In April, British researchers at University College London found that, rather than the recommended five, seven daily portions of

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问题     In April, British researchers at University College London found that, rather than the recommended five, seven daily portions of fresh fruit and vegetables were the key to health. They【C1】________that seven daily portions of fresh fruit and vegetables or more could reduce the risk of cancer by 25 percent and of heart disease by 31 percent,【C2】________to people who consumed less than one portion a day. The study was【C3】________the eating habits of more than 65,000 people in England【C4】________2001 and 2008.
    But a new study into the field of【C5】________eating says the famous five-a-day recommendation made by the UN’s World Health Organisation (WHO) in 2003 should be fine.
    Researchers in China and the United States went through 16 published investigations into diet and health【C6】________more than 830,000 participants, who were【C7】________for periods ranging from four and a half years to 26 years. Every additional daily serving of fruit and vegetables reduced the【C8】________risk of premature death from all【C9】________by five percent, the scientists found.【C10】________the period of the studies, 56,000 of the participants died, researchers said. In the case of death from a heart attack or a stroke, each additional serving【C11】________risk by four percent.
    【C12】________there was no evidence of an additional fall in risk beyond five portions, according to the【C13】________ published online Tuesday by the British Medical Journal (BMJ). "We found a threshold of around five servings a day of fruit and vegetables, after which the risk of death did not reduce【C14】________," said the investigators, led by Frank Hu of the Harvard School of Public Health in Boston, Massachusetts. High consumption of fruit and vegetable did not translate into a【C15】________reduction in the risk of death from cancer, the study also found.【C16】________advising patients about the【C17】________of healthy eating, doctors should also push home the message about risks from obesity, inactivity, smoking and【C18】________ drinking, said the paper.
    The London researchers【C19】________to being surprised by what they found and【C20】________the results may not be applicable to other countries.
【C15】
选项 A、instant
B、significant
C、abundant
D、trivial
答案B
解析 从前一段的论述“每日五种蔬果是临界点，之后死亡的风险不降低”可知，并不是蔬果吃得越多，死亡的风险就明显降低得越多，故选B项significant“显著的”。A项instant“立即的”，降低死亡风险并不是立刻就能看到的效果。C项 “充足的”，表示某东西数量很多，不符合本句语境。D项trivial“不重要的”，与原文意思正好相反。
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