When talking about our bodies, we often forget our skin. Actually, our skin is very important, too. It keeps us    1    (inform)of the outside world--    2    it is hot or cold, wet or dry.

Try this: pull up the skin from the back of your hand and then let     3    go. What happens?

The skin goes back to its first position, which means that skin is elastic (有弹性的).

Our skin seems to be very thin, but it     4       (make) up of two layers. The top layer is the one we wash every day. Do you know that this part of skin is dead? However, it is still very important because it serves as    5     (protect) against dirt and disease.

Skin has millions of tiny holes called pores(毛孔). Pores allow liquid, especially sweat,    6    (pass)through. By    7     (sweat), our bodies keep up a normal temperature. When it is very hot, we sweat a lot, but    8    (strange) enough, when it is quite cool, we also sweat. On a cool day, our bodies produce     9    average of 700 ml of sweat. That is    10    (much) than 0.5 kilos.

It is widely accepted that optimistic attitudes promote health as well as happiness. The secret of a long life is     1     (universe) desired and has long been sought. Today we can reveal it: always look on the bright side. A huge research project    2    (lead) by scientists at the Boston University School of Medicine concludes that optimists live    3     (long).

Lewina Lee, lead author of the study, said, “A lot of evidence    4    (suggest) that exceptional longevity( 长 寿 ) is widely accompanied by a longer span of good health and living    5     disability. Therefore our findings raise an exciting possibility    6     we may be able to promote health and   happiness by    7    (develop) positive attitudes such as optimism.”

However, the study doesn’t suggest that we should aim for great pleasure. Sadness is    8     important part of the human condition. Any normal person sometimes experience disappointment, ambitions and the    9    (lose) of loved ones. But for many people, these matters of human existence     10     (transform) into an abnormal state of despair. There is a vital place in public health for providing mental treatment in helping to correct these cognitive errors. It is not weakness to be defeated by setbacks. It is merely a mistake.

Do you know sports lotteries(彩票)? Young people can get addicted to it, especially if they win, they    1     (think) playing the lottery is the right way to make money. But it’s not. Tiantian, a student in our city,     2     (go) home on time to study after class every day before. But for the past two months, he     3     (run) home to do a new kind of “homework”. He’s busy picking lucky numbers in sports lotteries.

He said he    4     (spend) 20 yuan buying lottery tickets every week. Of course, he     5     (win) little money. “So I     6     (be going to) keep on buying tickets every week,” he said. Quite a lot of young students, like Tiantian,     7     (attract) by this game. Because all of them believe “Win big money with only two yuan!” In fact, Tiantian didn’t win big money, at the same time he     8     (fail) in his study. Experts say the lottery is bad for students.

With the invention of personal computers, the Internet and cell phones, people now have more immediate access     1     others than any time in history.     2     is shocking to find that losing this access leads to “disconnect anxiety”, which is a psychological term used to describe the     3     (anxiety)feelings that people experience when they are unable     4     (use)their cell phones or cannot log on to the Internet. Some people     5     (affect)by “disconnect” anxiety may start to feel     6     (disappoint)when they cannot reach their friends online. Others get really worried when they are not able to respond to emergencies, and this makes them feel     7     (absolute)awful. Still others who depend so much     8     their cell phones are frightened of missing any phone calls. So important     9     cell phones and the Internet become that they can not put up     10     living without them.