“For those who haven’t been to Tibet, Tibet is a dream; for those who have a   1   been there, Tibet is a remembrance（记忆）.” said Li Wan, a graduate from Zhongshan University. “To local Tibetans, Tibet is a way of life. But to me, l   2 there is my life-time goal.”
Ms. Li suddenly showed her strong i   3   in Tibet after having worked in a company for less than three months. Since 1998, Li has spent most of her time in a war that is a challenge(挑战) to her life—she has got to almost every c   4  of Tibet within 8 years.
Li’s first trip to Tibet was only out of her loving freedom. She entered Tibet a   5  the Yunnan-Tibetan road. Although she couldn’t speak a word of Tibetan l  6  , this did not really stop her from t____7____ with local people. “To me, they are free, happy and c   8   to nature. It a   9   to me that people should live in this way, singing while working, dancing while living,” Li said.
Li described Tibet in words and photos. “My goal in the n   10   ten years is to make a good documentary.” said Li.

“For those who haven’t been to Tibet, Tibet is a dream; for those who have a   1   been there, Tibet is a remembrance（记忆）.” said Li Wan, a graduate from Zhongshan University. “To local Tibetans, Tibet is a way of life. But to me, l   2 there is my life-time goal.”

Ms. Li suddenly showed her strong i   3   in Tibet after having worked in a company for less than three months. Since 1998, Li has spent most of her time in a war that is a challenge(挑战) to her life—she has got to almost every c   4  of Tibet within 8 years.

Li’s first trip to Tibet was only out of her loving freedom. She entered Tibet a   5  the Yunnan-Tibetan road. Although she couldn’t speak a word of Tibetan l  6  , this did not really stop her from t____7____ with local people. “To me, they are free, happy and c   8   to nature. It a   9   to me that people should live in this way, singing while working, dancing while living,” Li said.

Li described Tibet in words and photos. “My goal in the n   10   ten years is to make a good documentary.” said Li.

Sleep is very important. A person who does not sleep dies faster than a person who does not eat. We spend about a third()of our lives in sleep. That’s about 121 days a year!
How much sleep do we need? We are all different. A baby needs 16 hours of sleep every day. Children of 6 to 12 years of age need an average(平均)of 10 to 12 hours of sleep. Teenagers need 9 to 10 hours of sleep. An adult needs an average of 7 to 8 hours a day. There are some people who need only 3 hours of sleep; others need 10 hours of sleep. After the age of 50, the average sleep time goes down to 6.5 hours a day. We need less sleep as we get older.
About one in three Americans has a problem with sleep. Many of these people cannot fall asleep. The name for this problem is insomnia. Some people say, “I didn’t sleep all night.” But that’s not really true. They may sleep lightly and wake up several times. In the morning, they only remember the time they were awake, so they think they were awake all night.
This is not a new problem. Many famous people in history had insomnia. Some of these people had special ideas to make themselves sleep. Benjamin Franklin had four beds. He moved from one to the other to fall asleep. Mark Twain had a different way. He lay on his side across the end of the bed!
【小题1】How long do we spend in sleep a year?