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 fires. 参考答案:D 答案解析:[听力原文]11-13 When Iraqi troops blew up hundreds of Kuwaiti oil wells at the end of the Gulf Wa
第2题: [多项选择]设备润滑的目的是()和()。 A. 降低温度 B. 升高温度 C. 增加磨损 D. 减小磨损 参考答案:A, D