Direction: Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need.

    Red grouper(石斑鱼) are known for a few key characteristics — their color, which can {#blank#}1{#/blank#}from pink to bright orange; their tastiness, whether they're grilled or fried; and their predation (掠夺行为) method, in which they {#blank#}2{#/blank#} sea creatures and swallow them whole.

    But their least-known characteristic might be the most valuable of all: They operate as underwater architects, {#blank#}3{#/blank#} the seascape for numerous other forms of underwater life. That surprising discovery is {#blank#}4{#/blank#} scientists and policymakers to readjust their approach to preserving the ocean's natural order — and heightening tensions with those who fish for a living or as a hobby.

    A team of scientists, led by Florida State University's Felicia Coleman, recently found that the red grouper off Florida's east and west coasts have created entire ocean {#blank#}5{#/blank#}by digging large holes in the sea's sandy bottom. In the same way beavers {#blank#}6{#/blank#}dams, red grouper dig and maintain distinct holes whose rocky surfaces provide a place for coral, sponges and other marine life to gather.

    This new understanding is changing the way federal and state authorities manage ocean habitats and is creating a completely new crack with fishermen. “The people who are in control want to {#blank#}7{#/blank#} fishing as much as possible,” said Bob Jones, executive director of the Southeastern Fisheries Association. He added that the recent discoveries about red grouper amount to an “excuse they can use to restrict fishing, {#blank#}8{#/blank#}or recreational.”

    But to many researchers, fishery officials and even some fishermen, the fact that fish act as environmental engineers provides a compelling reason to protect them from exploitation.

    “If you {#blank#}9{#/blank#} that fish, it puts into motion a whole chain of events,” said Don deMaria, who used to fish for red grouper near Key Largo, Fla., but no longer does. “There's a whole lot of other animals that are {#blank#}10{#/blank#}. I'm not saying you can't catch them. But you can't do it to the extent we've been doing for the last 20 years.”

    As you may know, coral(珊瑚)is not a plant, but an animal. However, coral reefs(珊瑚礁)around the world are in{#blank#}1{#/blank#}. Here is a piece of bad news. Thailand will close one of its beaches to protect its coral  {#blank#}2{#/blank#} business activities for tourists. The beach is so famous that {#blank#}3{#/blank#}of tourists put it on their wish lists. More than 5,000 visitors visit it a day. They arrive by boat. This does{#blank#}4{#/blank#} harm to the coral reefs. Most of the coral has died. The beach will be closed between June and September to let the coral come{#blank#}5{#/blank#}to life.

    Experts(专家)say that 80％of Thailand's coral reefs have been{#blank#}6{#/blank#}. Too many tourists {#blank#}7{#/blank#} a lot of pollution to these beaches. An expert said the biggest problems were hotels by the beaches, boats, and plastic waste in the sea. He believed the {#blank#}8{#/blank#}choice was to close the beaches forever. He said, "I hope the  {#blank#}9{#/blank#}  can take steps to protect the coral reefs. At the same time, I also hope all of us should{#blank#}10{#/blank#}our best to protect the environment around us."

Can a precise word total ever be known? No, says Professor David Crystal, known chiefly for his research in English language studies and author of around 100 books on the {#blank#}1{#/blank#}. "It's like asking how many stars there are in the sky. It's impossible to answer," he said.

An easier question to answer, he {#blank#}2{#/blank#}, is the size of the average person's vocabulary. He suggests taking a sample of about 20 or 30 pages from a medium-sized dictionary, which {#blank#}3{#/blank#} about 100,000 entries or 1,000 or 1,500 pages.

Tick off the ones you know and count them. Then {#blank#}4{#/blank#} that by the number of pages and you will discover how many words you know. Most people vastly underestimate their {#blank#}5{#/blank#}.

"Most people know half the words—about 50,000—easily. A reasonably educated person about 75,000 and a really cool, smart person well, maybe all of them but that is rather {#blank#}6{#/blank#}. An ordinary person, one who has not been to university say, would know about 35,000 quite easily."

The formula can be used to calculate the number of words a person uses, but a person's active language will always be less than their {#blank#}7{#/blank#}, the difference being about a third.

Prof Crystal says exposure to reading will obviously expand a person's vocabulary but the level of a person's education does not {#blank#}8{#/blank#} decide things. "A person with a poor education perhaps may not be able to read or read much, but they will know words and may have a very {#blank#}9{#/blank#} vocabulary about pop songs or motorbikes. I've met children that you could {#blank#}10{#/blank#} as having a poor education and they knew hundreds of words about skateboards that you won't find in a dictionary."

Museums Rethink What to Do with Their African Art Collections

Recently, a discussion is happening in museums around the world over the volume of African art in their collections. Officials in Germany and the Netherlands have announced plans to return art and artifacts (文物) taken from Africa during the{#blank#}1{#/blank#}period. And more museum staff are meeting on the topic across Europe.

According to the most commonly{#blank#}2{#/blank#}figures from UNESCO（United Nations Educational, Scientifie and Cultural Organization）, 90% to 95%of sub-Saharan cultural artifacts are{#blank#}3{#/blank#}outside Africa. Many were taken by force long ago and ended up in museums across Europe and North America.

At the Africa Museum in Belgium, director Guido Gryseels says 85 percent of the-museum's collection comes from the Congo-the site of Belgium's{#blank#}4{#/blank#}colony in Central Africa. For decades, Congolese leaders have asked for these objects to be returned. Most of their{#blank#}5{#/blank#}, and those by African countries to other museums, have been refused.

But recent events in Europe have{#blank#}6{#/blank#}the possibility of returns at a much larger scale. In addition to the plans announced in Germany, last year France conducted a study of how much African art French museums are holding and made{#blank#}7{#/blank#}about what to do with it.

The study recommended the return of a wide range of objects taken by force. The suggestion got mixed{#blank#}8{#/blank#}in France, where there are at least 90000 African items in museums.

In France, some people have suggested returns could leave shelves{#blank#}9{#/blank#}in French museums. Cecile Fromont, a French historian of Central African art, says that's not going to happen. One way of thinking about it, she says, is that more African art can go on display.

However, Guido Gryseels of the Africa Museum in Belgium{#blank#}10{#/blank#}that attitudes are changing. He says he's in discussion with the Congo to return works.