收集的水可以使用浓度为（）的碘溶液杀菌消毒。
A.0.5%
B.1.5%
C.2.5%
参考答案：C
Many people cut down their daily spending in order to ______ the financial crisis (金融危机). [ ]
A. prevent
B. keep
C. quit
D. survive
计算机病毒具有潜伏性，仅在满足某些触发条件时才发作。( )
