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 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 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 cast 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 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 Adballahi 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.
By using “dark cloud” to describe locusts in the first paragraph, the author mainly meant to______.

A．show the size, speed and damage of the mass of locusts

B．suggest the high speed that locusts travel at

C．warn that locusts would sweep the continent severely

D．hint that they look like dark monster

The story is mainly about______.

A．West Africa’s united effort in fighting a disaster

B．the difficulty in controlling locusts

C．the great damage locusts caused to West Africa

D．a struggle to fight against a disaster brought by locusts in West Africa

According to the text we learn that the locust disaster______.

A．can be even more serious in Asia

B．is then out of control

C．has affected greatly most areas

D．cannot be stopped unless twice as much pesticide is provided for the affected areas

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 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 untied but still lack pesticide.