【单选题】

Questions 11 to 13 are based on the following passage.At the end of the passage, you will be given 15 seconds to answer the questions.

Now, listen to the passage.
What were the scientists worried about soon after the Gulf WarA．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 fires.