Have you ever been to Yellowstone National Park，a national park primarily in the US state of Wyoming（怀俄明州）？At Yellowstone National Park，① ． When they are heated for more than a few minutes，they will break up．

    In Atlanta，the USA，there is a popular restaurant which is very special．In the restaurant，waiters no longer throw uneaten food into litter cans．Instead，② ．

    In America，a new activity known as"zero waste"is becoming popular．It is carried out in schools，cafes，gyms，parks，restaurants and other places．"Zero waste"activity calls on people to produce less litter．It encourages people to reuse whatever they can．

    Although the idea seems a little unrealistic （不现实的），it is necessary．According to a new report，American people produce the largest amount of the litter in the world．Each person produces almost 4.6pounds of litter every day．More than half of the litter which is put into landfills is harmful ． Actually，this is bad for the environment．Besides this，more landfills（填埋场） are needed．

    "Nobody wants to have a landfill lying near his house，"said Jon D．Johnson from the Environmental Protection Agency，which helps to carry out"zero waste"activity．"There are not enough landfills，so we can't put all our litter into them．We should try to recycle it as much as we can．"

    This week, our topic is pollution. What are the answers to all of our pollution problems? We asked two experts to give their views.

    ◇Forest Smith is a member of Green First, an environmental group.

    Our future on the Earth looks very bad. We are dumping waste on our land. We can't breathe the fresh air. The sea is polluted too.

    I visited some relatives recently in a small village. They grow their own food and cycle everywhere. They are not wealthy, but they are happy and healthy.

    We must close the factories producing useless products. That will reduce rubbish and air pollution. We must recycle more, give up all cars, and improve public transport.

    A big problem is overpopulation in big cities. We must give up big cities and factories, and go back to a simple way of life.

    ◇John Green is a scientist at a university.

    Things are not as bad as Forest says. We'll have a bright future. We don't need to give up cars but we need to invent better, cleaner engines.

    This won't stop the problem of traffic jams. So we need better public transport. We should also recycle more.

    But some things are getting better. My sister returned last month after living abroad for five years. She said, “Our old neighbourhood doesn't look the same as before－it is cleaner and greener now.”

    In a word, science has brought many improvements to our life.

    Bob comes out of the station and at first{#blank#}1{#/blank#} This is the first time he has come to this town. He comes to see his good friend, Peter. Peter is a worker. He works in a factory. {#blank#}2{#/blank#}

    He walks in the streets. He passes a hospital, a post office, a bookshop and at last he gets to a school. Some students are coming out. He asks one of them, "Excuse me? {#blank#}3{#/blank#}"

    "Of course, I know. I live near there. My father works in that factory. It's outside this town，" answers the boy.

    "Is it far from here？{#blank#}4{#/blank#} " Bob asks again.

    "I'm going home now. You can come with me. I'll take you there. "

"That's great! Thank you very much!" says Bob.

    "You're welcome. {#blank#}5{#/blank#} We'll take the No. 1 bus there. "

    Researchers say that nearly two thirds of children don't get enough sleep, and this can make them nervous and slower at school. So how long should young people sleep each night? The answer is between 8 and 10 hours. If you don't get enough sleep at night, you'll have less energy the next day.

    A report shows that children sleep less because they have TVs and computers in their rooms, and busy parents don't read to their younger children at night any more. The traditional "bedtime story" helps children to relax and fall asleep peacefully. Children with TVs and computers in their bedrooms were more likely to sleep badly, and to get less than eight hours' sleep. Even losing one hour's sleep a night can mean that children do worse than usual at school.

    British scientists think that your brain keeps working while you're asleep. To show that they were right, they have done an experiment. They gave two groups of people a problem to work out. One group went to sleep, and the other group stayed awake. You want to know the result? The people who slept worked out the answer more quickly. Researchers explained that their brains were trying to find the answer while the people were asleep. So, make sure you get enough sleep tonight, 'and you'll be at your best tomorrow!

    People who are scared of heights should try not to drive over a new bridge in Guizhou. The new bridge, called the Beipanjiang Bridge, is the highest one in the world. Located near Bijie in Guizhou Province, the bridge stands 565 meters above a deep river. It connects the mountainous provinces of Guizhou and Yunnan. Just how high is the new bridge? Think of a 200-storey(层) building.

    Guizhou Province is already home to seven of the ten highest bridges in China. The Beipanjiang Bridge has just overtaken (超过t ) the Sidu River Bridge in Hubei Province to become the world's highest。

    The building of the Beipanjiang Bridge started in 2012 and it was opened to traffic (通车) on December 29 ,2016. It cost about 100 million yuan.

    The Beipanjiang Bridge is part of a highway（高速公路) connecting Hangzhou City in Zhejiang Province and Ruili City in Yunnan Province. The bridge is 1, 341 4 meters long and it cuts the travel time from Liupanshui in Guizhou to Xuanwei in Yunnan from around five hours to just over an hour。

    China is no stranger to record-breaking bridges. The second- and third-highest bridges in the world are also locateed in the country. The Beipanjiang Bridge is five meters higher than the previous（先前的）record holder.

Where: the world's third-heighest bridge, {#blank#}5{#/blank#}.

⑴{#blank#}1{#/blank#} Alice: I want to get some pictures of Jay Chou,

⑵{#blank#}2{#/blank#} Kate: I hope to buy some Christmas cards online.

⑶{#blank#}3{#/blank#} Tom: I need some information on pollution(污染).

⑷{#blank#}4{#/blank#} Harry: I would like to have some information about basketball.

⑸{#blank#}5{#/blank#} Dick: I will go to America. I want to know the famous places and the weather there.