题目

夏天从冰箱里拿出一饮料在空气中瓶外壁会潮湿，说明空气中含有 A．氮气        B．水蒸气      C．氧气       D．二氧化碳 答案：BMost disaster experts believe there is the potential ____ things could get a lot worse. [     ]A. what B. that C. where D. which