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  3. Eating fruits and vegetables has proved helpful in preventing various chronic(慢性的)illnesses. Does that mean the more the better?

Eating fruits and vegetables has proved helpful in preventing various chronic(慢性的)illnesses. Does that mean the more the better?

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问题     Eating fruits and vegetables has proved helpful in preventing various chronic(慢性的)illnesses. Does that mean the more the better?
    The data from 16 studies were analyzed,【C1】______more than 833,234 adults. The span of the studies【C2】______from 5 to 26 years. 56,423 adults participating in the studies died. Overall, the more fruits and vegetables people【C3】______, the less likely they were to have died during the study period. For every【C4】______serving eaten, up to four a day, the chance of dying for any reason decreased by 5 percent. Those who ate four servings a day were 24 percent less【C5】______to have died than those who ate none at all. However, eating five or more daily servings indicated no added【C6】______. Higher consumption of fruits and vegetables also showed【C7】______no effect on the probability of dying from cancer.
    Although the recommendation of the【C8】______serving varies with age, health status and other factors, most adults are called for to fill half their plate with fruits and vegetables. The food pyramid(金字塔)model【C9】______that adults eat three to five servings of vegetables and two to four servings of fruits daily.
    However, the study did not determine whether certain fruits or vegetables were more or less beneficial than others. It indeed inferred that there’s a(n)【C10】______to how much fruit and vegetables are good for you.
A)additional
B)annual
C)benefit
D)boundary
E)consumed
F)daily
G)essentially
H)financially
I)investing
J)involving
K)likely
L)limit
M)probable
N)ranged
O)suggested
【C10】
选项
答案L
解析 空格位于there be句型中，且位于不定冠词a(n)之后，故应填入名词。最后一句是全文的总结，根据上文研究得知，至于吃多少水果和蔬菜对人有好处，这是有限度的，故空格处应填入limit“限度”。备选的名词boundary“分界线”不符合文意，故排除。
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