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.
【答案解析】解析：从本句空格前的句意“我们发现一天五种蔬果是一个临界点，之后死亡的风险不减少……”和第三段中的论述the famous five-a-day recommendation．．．should be fine(著名的每日五种蔬果的搭配是合理的)可知，超过五种蔬果，再多吃也不能使死亡的风险减少多一点，故选A项further“进一步地”。