People’s fingernails and toenails, according【B1】________a recent study, are nowadays growing more quickly. Research carried out

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问题     People’s fingernails and toenails, according【B1】________a recent study, are nowadays growing more quickly. Research carried out at the University of North Carolina indicates that the speed at【B2】________ human nails are growing【B3】________ (increase) by close to 25 percent over the last 70 years.
    The results of the study show that the average human fingernail now grows about 3.5 mm a month,【B4】________ (compare) with just 3 mm seven decades ago. Toenail growth, although only about 2 mm per month, was also upon the figure obtained in【B5】________similar survey done 70 years ago.
    Researchers put the rapid increase down to changes in lifestyle, particularly the greater awareness of the【B6】________ (important) of regular exercise【B7】________a healthy diet. This, they point out, is in line with similar trends in the height and weight of present- day adults.【B8】________ (interest), it appears that nails tend【B9】________ (grow) fastest in warm conditions, with the quickest growth rate among young people, and men. The fastest-growing nail is on the middle finger, while that on the little finger is by far the【B10】________ (slow), at only a little over 3mm each month.
【B2】

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答案which

解析 “at which”引导定语从句,修饰先行词“the speed”。
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