【单选题】

Questions 18-20 are based on the following monologue introducing the consequences of the Gulf War. You now have 15 seconds to read Questions 18-20. The consequence of the Gulf War that has called the concerns of the scientists is ______.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 rims.