The skin is an essential part of your body and the【小题1】 (large) organ of it. You have three layers of skin【小题2】act as a barrier against disease, poisons and the sun's harmful rays. The functions of your skin are also very complex: it keeps you warm or cool it prevents your body from【小题3】(lose) too much water; it is where you feel cold, heat or pain and it gives you your sense of touch.

Eyes are the window of our soul. We humans are only born【小题1】one set of eyes, so it is our job to take care of them. Almost all doctors agree【小题2】we can improve and maintain good eyesight by 【小题3】(eat) lots of fresh vegetables. It is【小题4】(especial) important for us to eat vegetables like carrots and sweet potatoes.【小题5】, it is necessary【小题6】(protect) our eyes when we spend a long time in using computer, and we should take【小题7】short break every fifteen minutes to reduce the 【小题8】(chance) of losing our eyesight. As the saying【小题9】(go), “It’s all fun and game, until someone loses an eye”. If you want to know more about protecting your eyes, please【小题10】(click)the following website.

Gray Hair Can Return to Its Original Color

Few signs of old age are clearer than the sight of gray hair. 【小题1】 we grow older, our strands of hair lose their youthful color. Although this may seem like a permanent change, new research reveals that gray hairs 【小题2】 miraculously regain color — at least temporarily.

In one 1972 paper, the late doctor Stanley Comaish reported an isolated case of a 38-year-old man, with his three strands 【小题3】(be) light near the ends but dark near the roots. This signaled a reversal in the normal graying process, 【小题4】 begins at the root.

A new study from researchers at Columbia University is the first 【小题5】(offer) quantitative evidence linking psychological stress to graying hair in people. Having analyzed individual hairs from 14 volunteers, researchers compared the results with each volunteer’s stress diary, in which individuals’ review of their calendars and each week’s level of stress rated are included.

When hairs were aligned with (与……对照) stress diaries, striking associations between stress and hair graying 【小题6】(reveal) and, in some cases, there was a reversal of graying when stress was removed. There was one individual who went on a long vacation, and five hairs on that person’s head returned back to dark during the vacation.

Although it may seem easy to understand 【小题7】 stress can speed up graying, the researchers were surprised to discover that hair color can be restored when stress is eased. We could picture hair as a powerful tool to assess the effects of 【小题8】(early) life events on aging — because hair provides a kind of physical record of past events, much【小题9】 the rings of a tree. It’s pretty clear that the hair encodes part of your biological history in some way. Hair grows out of the body, and then it crystallizes into 【小题10】 hard and stable that holds the memory of your past.