阅读下面短文，根据其内容写一篇60词左右的内容概要。
Are you sick of going to bed late and waking up tired? Then grab your hiking boots and a tent. A new study suggests that a couple days of camping in the great outdoors can reset your circadian (昼夜节律的)clock and help you get more sleep.
The circadian clock, more commonly known as the body clock, is an internal system that tells our bodies when it's time to go to sleep and when it's time to wake up. Scientists track this clock by measuring the amount of melatonin(褪黑激素)circulating in a person’s blood at any given time. In a healthy sleeper, melatonin levels rise a few hours before bedtime, stay high through the night, and then settle back down when it's time to wake up.
In our modern society, however, most of us stay up many hours past sunset and would probably sleep in many hours after sunrise if we could. And the trouble is that your melatonin levels may still be high when your alarm clock goes off in the morning, which leads to grogginess(头晕眼花). It may also have other health consequences as well, such as diabetes(糖尿病), overweight problems and heart disease
Professor Kenneth P. Wright of the University of Colorado in the US wanted to see if our body clocks can be reset by a short stay in nature. His team recruited (招收)14 physically active volunteers in their 20s and 30s. Nine went on a weekend camping trip, while the other five stayed home. At the end of the weekend, the researchers reported that in just two days, the campers' body clocks had shifted so that their melatonin levels began to rise more than an hour earlier than they did before they left on the trip. By contrast, the body clocks of the group that stayed home shifted even later over the course of the weekend. ''This tells us we can reset our clocks fast, '' Wright said.
Therefore, if you want to change your sleep patterns you could try to increase your exposure to natural light during the day and decrease the amount of artificial light you see at night.
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假如你是校学生会主席李华，美国一学生访问团将于暑假来你校参观访问。请你写封邮件，将本次活动安排告知该访问团的负责人Mr Smith,并征询他对安排的意见。
活动安排：1，体验中国绘画；2，品尝特色午餐；3，观看地方戏表演。
注意: 1.词数80左右;
2.可以适当增加细节，以使行文连贯;
参考词汇： 俗语 saying
Dear Trevor,
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Yours,
Li Hua
阅读下面材料，在空白处填入1个适当单词的或括号内单词的正确形式。
Scientists found that air pollution may be responsible 1. a big reduction in 2. (intelligent). Research showed that air pollution led to big falls in test 3. (score) for languages and mathematics. The study called "The influence of air pollution on cognitive (认知的)performance"4.(conduct) over four years ago. Researchers analyzed speaking and mathematics tests 5. (take) by 20,000 people of all ages. They said, "Polluted air may do harm to cognitive ability as people become older. "
The study is a warning to the rest of the world ,6.(particular) those in cities. Over 91 percent of the world population live in areas with polluted air,7. is the fourth biggest cause of global deaths. Researchers discovered that the 8.(long) people were exposed to polluted air, the greater their cognitive ability went down. They said air pollution caused a year' s worth of lost education. For those aged over 60, this could be several years. A researcher warned, "There 9.be) no shortcut to solve this issue. Governments really need to take effective measures 10.(reduce) air pollution. "
11-year-old TJ had just jumped off the scooter(滑板车)as his neighbor Kim, aged 7, and her sister Julie, 9, looked on. That was _____a man with messy hair appeared. Without a word, he picked Kim up and _______walked away.
He held her like a baby.______, the calm way the man held Kim made TJ believe he must have been a ______. But eventually something was not _____. TJ could see Kim's face—she was scared. Her fear turned into________, then begging for help. She began kicking and trying to ____the man's arms." What are you doing?" Julie_____.But the man, undisturbed, walked along the block until he reached an alley and _____.
TJ's first ______was to follow them. But how could an 11-year-old kid _____a grown man? So he ran to his grown-up neighbors' home and shouted，" A man______picked up a little girl and took her into the alley!" Then instantly TJ was gone, back on the street 48__his little friend.
Once TJ_____the alley, he recognized the man, standing in front of an abandoned house. He was pushing the _____girl through a window. Fortunately, Julie and other neighbors, the police and the mother of the victim soon arrived _____to save the girl. Kim dashed into her mother's _____arms, and the two cried and hugged. Meanwhile, officers_____the man.
That news came as no_____to TJ's mother. She thinks this is exactly his _____. And his first thought is not of himself. It's always of others.
1.A.how B.when C.why D.where
2.A.hurriedly B.secretly C.calmly D.anxiously
3.A.On purpose B.After all C.In consequence D.In fact
4.A.father B.relative C.stranger D.neighbor
5.A.right B.common C.harmonious D.reliable
6.A.eagerness B.cheers C.sobs D.silence
7.A.get free of B.throw away C.take hold of D.deal with
8.A.reminded B.warned C.begged D.yelled
9.A.resisted B.survived C.disappeared D.returned
10.A.idea B.impression C.action D.target
11.A.prevent B.attack C.follow D.threaten
12.A.yet B.already C.even D.just
13.A.waiting for B.running after C.playing with D.staring at
14.A.found B.walked C.missed D.reached
15.A.sensitive B.worried C.panicked D.hopeless
16.A.behind time B.against time C.over time D.in time
17.A.warm B.safe C.comfortable D.welcome
18.A.shot B.arrested C.defeated D.fined
19.A.surprise B.prediction C.sense D.reason
20.A.duty B.hobby C.character D.identity
New Year's Traditions Around the World
There are many traditions around the world to celebrate the New Year. Here's a look at a few of them.
Drive off bad luck
Many cultures have traditions meant to scare off bad luck. This often involves using fire or loud noises in the form of fireworks! In Scotland, for example, people hold bonfire celebrations. Men from villages walk through the streets swinging giant burning fireballs over their heads. 1..
Food for good luck
2.. In the southern part of the United States , people often eat black-eyed peas and pork for good luck in the New Year. In Spain, as the clock strikes midnight, people eat 12 grapes, which represent the 12 months of the year. It guarantees that the year will be filled with good luck.
Clothing traditions
Many people like to wear new clothing to start the New Year. In Romania, there is a tradition that involves dressing up in a bear costume .3.,if this won't! In Brazil, some people wear colorful underwear on New Year's Eve. The most popular colors are red and yellow. 4.. Yellow is supposed to bring you money.
5.
Many use the start of New Year as a time to try something new or change something about themselves. The New Year is a perfect time to change yourself for the better. That is why many people have the tradition of making a New Year's resolution. It is usually about living healthier or having more success in life.
These are just a handful of traditions. Tell us about a New Year's tradition in your culture!
A.Learn something new
B.I don't know what will scare off evil spirits
C.Make a New Year's resolution
D.Red is supposed to bring you love
E.Food plays an important role in people's life
F.And these fireballs are supposed to clean the coming year
G.Many cultures have certain diets that are said to bring good luck
It began as a game: High school and college students studying computer technology figured out they could use personal computers to break into telephone company computers and make free, long-distance telephone calls. These young computer talents soon gained the name "hackers".
Police arrested a few hackers, but many went on to even more complex hacking. One of them was arrested for making illegal telephone calls and later he used a phone to change a police officer's credit records to get back at the officer for arresting him. He also used a computer to change his college records to give himself better grades.
As hackers gained experience, they began invading computers at banks, airlines and other businesses. In one case a hacker instructed an airline' s computer to give him free airplane tickets.
The U.S. government is worried that hackers may break into its networks of defense computers. The government's secrets are easily attacked because thousands of government computers are connected by telephone lines that hackers can get into.
In November 1988, a college student entered a U.S. Defense Department computer network called Arpanet. The hacker injected a computer program that made copies of itself throughout Arpanet. Some hackers use viruses to destroy all the data in a computer. But in this case, government officials shut down the network before the program reached every computer in the system. Shutting down the system angered many researchers who were using the computers. The hacker turned himself in to the police and he was charged with a crime.
The incident put the spotlight on computer hacking in the United States. Many companies have hired experts to protect their computers from hackers, and many computer experts now advise companies on how to protect their computers.
The U.S. government believes foreign governments have hired hackers to try to break into top-secret defense computers.
Experts disagree over whether a computer network can ever be safe from hacking. But in the future, some of the most outstanding minds in the U.S. will be working to frustrate the attempts of computer hackers.
1.What did the first hackers do?
A.They broke into government computers. B.They destroyed airplane ticket systems.
C.They played computer games. D.They made free phone calls.
2.Why can U.S. government computers be easily hacked into?
A.They have no defense systems. B.They are connected by telephone lines.
C.They are partly accessible to the public. D.They lack complex processing programs.
3.What happened to the government computers in November 1988?
A.They lost all of the important data.
B.They were shut down by researchers.
C.They were invaded by a college student.
D.They got totally ruined by a computer program.
4.What did companies decide to do to protect their computer systems?
A.Employ computer talents. B.Build secret defense systems.
C.Ask the government for help. D.Collect and analyze the data of hackers.
