By the time he arrives in Beijing, we here for two days. A．will have stayed B．will be staying C．have been staying D．have stayed 题目和参考答案——青夏教育精英家教网—

题目内容

By the time he arrives in Beijing, we ______ here for two days.

A．will have stayed B．will be staying

C．have been staying D．have stayed

【答案】

【解析】

试题分析：考查时态：句意：在他到北京的时候为止，我们已经呆在这儿两天了。说明我们在这儿待两天是在他到这儿之前，用过去完成时。还有介词by，是和相应的完成式连用的，by接过去时间，用过去完成时，by接将来时间，用将来完成时。选A。

考点：考查时态

点评：时态题的考查关键是抓住句子的上下文含义和句中的时间状语。要根据时间状语来选择合适的时态，在平时的学习中要注意积累有关时态的用法和各种时态的特殊之处。如介词by经常与相应的完成时连用。

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Researchers from King's College London studied 2,160 women aged between 18 and 79, looking at their telomeres - a biological marker of ageing found in DNA．As people get older, their telomeres get shorter and they are easy to have illnesses.

But the study found women with high levels of vitamin D had comparatively longer telomeres - a sign of being biologically younger and healthier.

The study suggests vitamin D may help to slow down the ageing process of DNA, and therefore the ageing process as a whole.

Lead researcher Dr Brent Richards said: "These results are exciting because they prove for the first time that people who have higher levels of vitamin D may age more slowly than people with lower levels of vitamin D．

"This could help to explain how vitamin D has a protective effect on many ageing related diseases, such as heart disease and cancer."

He said further studies are required to confirm the findings.

Professor Tim Spector, head of KCL's twin research unit, and a co-author of the report, added: "Although it might sound absurd(荒谬的), it's possible that the same sunshine which may increase our risk of skin cancer may also have a healthy effect on the general ageing process."

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Other studies have suggested the vitamin plays a key role in protecting against cancer and heart disease.

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