题目内容
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
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． 1 Sharks eat fish, other sharks, and plants that live in the ocean．
Sharks grow slowly．About forty percent of all sharks lay eggs． 2 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, overfishing 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． 3
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． 4 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． 5
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 o f them．
D．These powerful senses help sharks find their food．
E．If too many sharks in one area are killed, that group of sharks may never return to normal population levels．
F．This is a threat to other forms of life in the ocean．
G．The others give birth to live young．
解析：
|
D G B A E |
优学名师名题系列答案第二节（共5小题；每小题2分，满分10分）
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
In 1990 a report was published about what the earth might be like 20 years from then on. 71 According to the report,the picture of the earth in the year 2010 is not a pleasant one. 72 The population could be as large as 6300 million,almost 2150 million more than in 1985.More people would move into cities ,especially cities in developing countries.Cities like Cairo and Jakarta probably would each have 15 million by then.
73 Farmers will grow 90% more food than they did in 1985,but most of the increase would be in countries that already produce enough food for their people. 74 Poor farming ways are destroying large areas of crop land,changing farms into deserts.More farmland is lost as cities become larger and more houses are built.Air pollution will get worse as industrial countries burn more coal and oil.Many of the world's forests could disappear as more and more trees are cut down.Energy will continue to be a serious problem. 75 They only workde out the situation that exists today.By changing the situation,by settling the problems,the picture can be changed.There is still time for the nations of the world to work out a plan of action.But they warned that waiting too long to make de cisions would greatly reduce the chances of success.
|
A．Food production will increase,but not enough to feed all the people. |
|
B．The report was a result of a three - year study. |
|
C．Later on,more reports came out one by one. |
|
D．The world will be more crowded because the population will continue to grow. |
E.Experts believe enough food will be produced in developing countries very soon.
F.The experts say their picture of the earth for the year 2010 may be wrong.
G.Little increase is expected in South Asia,Africa and the Middle East.