A. Energy crisis. B. Water as a possible solution to energy crisis. C. History of the use of water as a source of work energy. D. Properties of water. 参考答案:B 答案解析:[解析]主旨大意题。文章论述的是如何用水尤其是海水来作能源,解决人类面临的能源问题。答案选 [B]。文章虽然提到煤和石油会耗尽,但重点不是能源危机,故[A]错。文章只提到人类以前用水来产生能量,并不是
第33题: [单项选择]Only when the war was over()to his hometown. A. did the young soldier return B. the young soldier returned C. returned the young soldier D. the young soldier did return 参考答案:A 答案解析:
第38题: [单项选择]列是医院内下呼吸道感染的病原学诊断标准的是() A. 痰细菌定量培养分离病原菌数≥108cfu/ml B. 痰细菌定量培养分离病原菌数≥107cfu/ml C. 痰细菌定量培养分离病原菌数≥106cfu/ml D. 痰细菌定量培养分离病原菌数≥105fu/ml E. 痰细菌定量培养分离病原菌数≥104cfu/ml 参考答案:C 答案解析: