题目内容
Parts of Africa are covered by a dark cloud. But this is no rain cloud. It is a living cloud made of billions of locusts (蝗虫) that are traveling across the continent eating everything in their path.
And now in the battle to stop this disaster, a radio station in Senegal, West Africa, is offering listeners 50 kilograms of rice if they can catch and kill 50 kilograms of locusts. “We think this idea will get more people to take part in the war on the locusts,” said Abdoulaye Ba, from Sud-Fm, a radio station in one of Senegal’s worst affected area.
This is West Africa’s biggest locust disaster in 15 years, and it is moving east, causing huge damage to crops. As they move they produce young and increase their number and will soon threaten (威胁) Sudan in the northeast of Africa. Some say it could reach Asia.
Experts say the harmful effect on crops in areas already suffering from food shortage and war could cause many people to go hungry. Governments in the areas are not well equipped to fight the pest.
Although leaders of 12 countries have agreed on a plan, it is not expected to be enough. “We are now treating 6,000 hectares (公顷) per day with pesticide (杀虫剂), but we need to treat 20,000 hectares per day in order to have any hope of controlling this disaster,” said Mohamed Abdallahi Ould Babah, director of locust control in Mauritania.
Requests are being made for international aid, which is the only way to limit the disaster, the UN’s Food and Agriculture Organization warned.
71. By using “dark cloud” to describe locusts in the first paragraph, the author of the article ________.
A. showed the size and speed of the mass of locusts
B. suggested the great damage that locusts can cause
C. warned that locusts would sweep the continent like rain clouds
D. both A and B
72. The story is mainly about ________.
A. West Africa’s united effort in fighting a disaster
B. the difficulty in controlling locusts
C. how locusts caused great damage to West Africa
D. a struggle to fight against a disaster brought by locusts in West Africa
73. The locust disaster ________.
A. would be even more serious in Asia
B. is (was)out of control
C. affected only the warning areas
D. can not be stopped unless twice as much pesticide is provided for the affected areas
74. Which of the following is WRONG?
A. Sud-Fm offered a reward for fighting locusts so that more people would join in the effort.
B. Senegal is to the southwest of Sudan.
C. The locusts can cause such damage mainly because it has no natural enemy in West Africa.
D. 12 countries affected by locusts have united but still lack pesticide.
DDBC
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