听力原文: When Iraqi troops blew up hundreds of Kuwaiti oil wells at the end of the Gulf W
Many said "no way"; rain would wash the black powder from the atmosphere. But in America, air-sampling balloons have detected high concentrations of particles similar to those collected in Kuwait.
Now that the fires are out, scientists are turning their attention to yet another threat: the oil that didn't catch fire. It has formed huge lakes in the Kuwaiti desert. They trap insects and birds, and poison a variety of other desert animals and plants.
The only good news is that the oil lakes have not affected the underground water resources. So far, the oil has not been absorbed because of the hard sand just below the surface.
Nothing, however, stops the oil from evaporating. The resulting poisonous gases are choking nearby residents.
Officials are trying to organize a quick cleanup, but they're not sure how to do it. One possibility is to burn the oil. Get those black-powder detectors ready.
Questions:
18.What were the scientists worried about soon after the Gulf War?
19.What was the good news for scientists?
20.What are the officials trying to do at the moment?
(38)
A.The threat of poisonous desert animals and plants.
B.The exhaustion of energy resources.
C.The destruction of oil wells.
D.The spread of the black powder from the fares.