题目内容
Sharks are among the oldest animals on Earth. There are hundreds of kinds of sharks. Most are about two meters long. The dogfish shark, however, is less than twenty centimeters in length. A shark has an extremely good sense of smell. It can find small amounts of substances in water, such as blood, body liquids and chemicals produced by animals. 71 Sharks eat fish, other sharks, and plants that live in the ocean.
Sharks grow slowly. About forty percent of all sharks lay eggs. 72 Some sharks carry their young inside their bodies as humans do. Some sharks are not able to reproduce until they are twenty years old．Most reproduce only every two years. And they give birth to fewer than ten young sharks. For this reason, over-fishing of sharks is of special danger to the future of the animal.
Sharks are important for the world’s oceans. They eat injured and diseased fish. Their hunting activities mean that the numbers of other fish in ocean waters do not become too great. 73.
People hunt sharks for sport, food, medicine and their skin. Experts say the international market for some kinds of sharks has increased because many parts of a shark are valuable.
Collectors pay thousands of dollars for the jaws of a shark. 74 The skin of a shark can be used like leather.
In Asia, people enjoy a kind of soup made from shark fins. Experts say a fisherman can earn a lot of money for even one kilogram of shark fins. Sharks are among the oldest animals on Earth, but some sharks are in danger of disappearing from Earth.75.
| A．Shark liver oil is a popular source of Vitamin A |
| B．This protects the plants and other forms of life that exist in the oceans |
| C．Sharks are valuable to us and we can make full use of them |
| D．These powerful senses help sharks find their food |
F． his is a threat to other forms of life in the ocean.
G．The others give birth to live young
【小题1】D
【小题2】G
【小题3】B
【小题4】A
【小题5】E
解析
期末宝典单元检测分类复习卷系列答案Sharks have lived in the oceans for over 450 million years, long before dinosaurs appeared. There are now about 360 species of sharks, whose size, behavior, and other characteristics differ widely.
Every year, we catch and kill over 100 million sharks, mostly for food and for their fins. Dried shark fins are used to make shark fin soup, which sells for as much as $50 a bowl in fine Hong Kong restaurants. Other sharks are killed for sport and out of fear. Sharks are vulnerable(易受伤的) to overfishing because it takes most species 10 to 15 years to begin reproducing and they produce only a few offspring（后代）.
Influenced by movies and popular novels, most people see sharks as people-eating monsters. This is far from the truth. Every year, a few types of shark injure about 100 people worldwide and kill about 25. Most attacks are by great white sharks, which often feed on sea lions and other marine（海洋的） mammals. They sometimes mistake human swimmers for their normal prey, especially if they are wearing black wet suits.
If you are a typical ocean-goer, your chances of being killed by an unprovoked（非受挑衅而发生的）attack by a shark are about 1 in 100 million. You are more likely to be killed by a pig than a shark and thousands of times more likely to get killed when you drive a car.
Sharks help save human lives. In addition to providing people with food, they are helping us learn how to fight cancer, bacteria, and viruses. Sharks are very healthy and have aging processes similar to ours. Their highly effective immune system allows wounds to heal quickly without becoming infected, and their blood is being studied in connection with AIDS research.
Sharks are among the few animals in the world that almost never get cancer and eye cataracts（白内障）. Understanding why can help us improve human health. Chemicals taken from shark cartilage（软骨）have killed cancerous tumors in laboratory animals, research that someday could help prolong your life.
Sharks are needed in the world’s ocean ecosystems. Although they don’t need us, we need them. We are much more dangerous to sharks than they are to us. For every shark that bites a person, we kill one million sharks.
【小题1】Which of the following is NOT a reason why people kill sharks?
| A．People kill sharks for food. |
| B．People kill sharks for sport. |
| C．People kill sharks out of fear. |
| D．People kill sharks because they often attack swimmers. |
| A．There are many different species of sharks, but only a few of them are dangerous to humans. |
| B．Sharks never get ill. |
| C．Sharks are a valuable resource for human. |
| D．Sharks play an important role in the ocean ecosystem. |
| A．movies have given people the wrong impression of sharks |
| B．most sharks are dangerous to humans |
| C．sharks will attack anyone who is wearing black |
| D．it is dangerous to swim in the ocean |
| A．save | B．protect | C．lengthen | D．improve |
| A．Are Sharks Dangerous? | B．Sharks And Humans |
| C．Sharks: Humans’ Friends | D．Sharks Help Save Human Lives |
Some Chinese new - rich like eating shark fin soup because they think it shows their class. However, for the Chinese NBA idol Yao Ming, doing so is unacceptable as the practice has led to the overfishing of sharks.
When Yao and his wife Ye Li got married in 2007, they publicly announced that they would not allow shark fin soup to be served at their wedding banquet.
Actually, Yao had been saying no to shark fins since 2006, when he was appointed as the Goodwill Ambassador for wild life protection.
Now, the 226 - cm big guy is resorting to his personal influence to encourage more to say no to eating the soup and to raise awareness of protecting animals. “Sharks are friends of human beings. They are not our food,” Yao said.
Other celebrity athletes like Olympic champions. Li Ning and Kong Linghui are following on the heels of Yao, throwing themselves into serving the public as Goodwill Ambassadors for wild animal rescue. Recent reports about Yao’s retirement have saddened tens of thousands of basketball fans both at home and abroad. Yet Yao's influence goes far beyond the basketball courts.
Yao has engaged himself in charity and public welfare services for quite a while. When the devastating 8.0 －magnitude earthquake hit Wenchuan in southwest China in 2008 , Yao donated 2 million yuan. “When I was a little boy, my parents and teachers told me to help others and to be a good man,” Yao recalled. “But I could nor donate then because I had not much pocket money. After I moved to Houston, I got involved in quite a number of community service activities and I felt a strong sense of achievement when I got people together,”Yao said.
Like Yao, newly crowned French Open champion Li Na has showed her willingness to donate. Li gave 480,000 yuan of her prize money from the open, plus 20,000 yuan from her own pocket, to a local nursing home in her hometown. Another Chinese sports icon, hurdler Liu Xiang, has also been actively involved in charity for years.
【小题1】The reason why some Chinese new-rich like eating shark fin soup is that they think ．
| A．it is very delicious | B．it is very cheap and healthy |
| C．it is very popular in society | D．it can show their status |
| A．too many sharks are killed | B．he dislikes eating sharp fin |
| C．it is too expensive | D．sharks are dangerous animals |
| A．Li Na donated 500,000 yuan to a local nursing home in her hometown． |
| B．Yao Ming donated 2 million yuan after the earthquake of Wenchuan． |
| C．Yao Ming has encouraged more people to stop eating shark fin soup and protect animals． |
| D．Yao Ming was appointed as the Goodwill Ambassador for protecting wild life in 2007． |
| A．Rich and generous． | B．Influential and warmhearted． |
| C．Energetic and optimistic． | D．Popular and confident． |
| A．most athletes don't like eating shark fin soup |
| B．Yao Ming has been donating money to charity since he was a child |
| C．Yao Ming has an influence on not only the basketball courts but also charity and public welfare services |
| D．Yao Ming has taken part in many community service activities when he was in China |