Humans like to live and work in groups. Language is the “cement”(胶合剂){#blank#}1{#/blank#}holds these groups together. Language is part of culture. Culture, in this sense{#blank#}2{#/blank#}(mean)all those customs, skills, and attitudes that are part of the behavior of a {#blank#}3{#/blank#}(particularly) group. What you think {#blank#}4{#/blank#}what you want in life are all affected by the culture of the group in which you{#blank#}5{#/blank#} (raise). Groups of people live in different ways. They may have different skills, organizations, and art forms. Their family life may be completely different from yours.

    Human beings are inventive animals. They can decide to change their cultures in order to meet various{#blank#}6{#/blank#}(situation). Of all living things, human beings are the  {#blank#}7{#/blank#}(clever). They can choose {#blank#}8{#/blank#}(live)in many environments and in a wide variety of ways. Only human beings can choose where and how they want to live and then improve the physical environment to help{#blank#}9{#/blank#} (they)realize these choices. Acquiring the wisdom to make wise choices {#blank#}10{#/blank#}(be) the lasting challenge of being human.

    Once there was a wise landowner who had two sons. After a few years, the landowner fell ill badly. So he considered {#blank#}1{#/blank#} (select) one of them to rule the family according to their abilities. He called both of them and gave each one a room. He said，“You must fill your room completely with anything you wish. It can be anything! But there should not be any space {#blank#}2{#/blank#} (leave) behind and you should not seek advice {#blank#}3{#/blank#} others! "

    The next day, the landowner visited the {#blank#}4{#/blank#} (old) son's room. The room was completely filled with hay (干草). The landowner sighed on the {#blank#}5{#/blank#} (foolish) of the son. Then he went to the room given to the younger son. But it {#blank#}6{#/blank#} (keep) closed. The landowner knocked at the door. The younger son asked {#blank#}7{#/blank#} (he) father to get in and closed the door again. It was darkness everywhere and the landowner shouted at his son {#blank#}8{#/blank#} (angry). But the younger son lighted a candle {#blank#}9{#/blank#} said, “I have filled this room with light! Now the landowner felt very happy and hugged his son proudly. He understood that the younger would be the right person {#blank#}10{#/blank#} (rule) the family.

    Xuan paper, known as one of the Four Treasures of Study, first came into {#blank#}1{#/blank#} (exist) in Xuan Prefecture in the Tang dynasty. The traditional skill of making the paper {#blank#}2{#/blank#} hand has been passed down through generations. The process takes as many as 100 steps, all of {#blank#}3{#/blank#} require a level of delicacy.

    Take papermaking master Zhou Donghong for example. He uses a fine screen to filter（过滤） a mixture of water and fibers. He lifts it up, and it's a sheet of paper. It takes him and his partner only 15 seconds {#blank#}4{#/blank#} (form) and shape it, but they've devoted {#blank#}5{#/blank#} (them) to perfecting the skills for decades.

    "There are a lot of tricks of filtering the fibers, and timing is the {#blank#}6{#/blank#} (difficult) part of all. We have only one chance to filter the right amount of fibers, and only the proper weight guarantees the paper is neither too thin nor too thick, and the margin for error is {#blank#}7{#/blank#} (extreme) small," said Zhou. With just the right degree of thickness, top quality Xuan paper holds ink and water tightly.

    The skill of papermaking, {#blank#}8{#/blank#} (recognize) as a national treasure, has also proven to be an international one. We felt {#blank#}9{#/blank#} great sense of pride as it was listed as a world intangible culture heritage(非物质文化遗产) by UNESCO in 2009. Since then, in Jingxian County, Xuan papermaking {#blank#}10{#/blank#} (teach) in schools.

    Polar bears are suffering in a {#blank#}1{#/blank#} (warm) world than ever before. Polar bears live in environments too cold for most animals. During much of the year, they live and hunt on the{#blank#}2{#/blank#} (freeze) Arctic sea ice. Nature has prepared them for the cold conditions but nothing has prepared the bears for the danger that {#blank#}3{#/blank#} (threat) the only home they know. The scientists have drawn a {#blank#}4{#/blank#} (conclude) that the polar bears' world is melting. Studies show that the polar ice has reduced{#blank#}5{#/blank#}9.8% every 10 years since 1978. Now about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend on the sea ice for their {#blank#}6{#/blank#} (survive). "The sea ice is more than just this platform that the bears walk over." As Andrew Derocher, a scientist who studies North American polar bear populations puts {#blank#}7{#/blank#}, "Only if polar ice melts quite slowly {#blank#}8{#/blank#}they survive on the earth." Some melting and refreezing of the polar ice is natural. {#blank#}9{#/blank#} in a warmer world, these cycles speed up, and bears have less time to hunt. Normally, they have three months in the spring when they gain more weight. The extra fat is used later, {#blank#}10{#/blank#} the bears are not actively hunting.

    Increasingly, Americans are becoming their own doctors by going to diagnose their symptoms, order home health tests or medical devices, or even self-treat their illnesses with drugs from Internet pharmacies(药店).Some avoid doctors because of the high cost of medical care, especially{#blank#}1{#/blank#} they lack health insurance. Or they may stay away because they find it{#blank#}2{#/blank#}(embarrass) to discuss their weight, smoking, alcohol consumption or couch potato habits. Patients may also fear what they might learn about their health, or they distrust physicians because of negative {#blank#}3{#/blank#} (experience) in the past. But{#blank#}4{#/blank#}(play) doctor can also be a deadly game.

Every day, more than six million Americans turn to the Internet{#blank#}5{#/blank#}medical answers— and most of them aren't nearly sceptical enough of what they find. A 2002 survey by the Pew Internet &American Life Project found that 72 percent of those{#blank#}6{#/blank#}(survey) believe all or most of what they read on health websites. They shouldn't look up “headache” and the chances of finding {#blank#}7{#/blank#}(rely) and complete information, free from a motivation for commercial gain,{#blank#}8{#/blank#} (be) only one in ten, reports an April 2005 Brown Medical School study. Of the 169 websites the researchers rated, only 16 scored as “high quality”. Recent studies found faulty facts about all sorts of other disorders, causing one research team to warn that a large amount of incomplete, inaccurate and even dangerous{#blank#}9{#/blank#} (inform) exists on the Internet.

    The problem is most people don't know the safe way to surf the Web. “They use a search engine like Google, get 18 trillion choices and start clicking. But that's risky, because almost anybody can put up a site that looks authoritative ( 权威的), so it's hard to know if what you're reading is {#blank#}10{#/blank#}(reason) or not,” says Dr. Sarah Bass from the National Cancer Institute.