题目

As more people use smart phones to pay bills and store personal information, strict password safety has become more important than ever. A new study shows that free-form gestures — sweeping fingers in shapes across the screen of a smart phone — can be used to unlock phones. These gestures are less likely to be observed and reproduced by others than traditional typed passwords. “All that it takes to steal a password is a quick eye,” said one of the researchers of the study. “With all the personal information we have on our phones today, improving their safety is becoming incr2、下列调查适合普查的是（　　）A、调查2011年3月份市场上西湖龙井茶的质量B、了解萧山电视台188热线的收视率情况C、网上调查萧山人民的生活幸福指数D、了解全班同学身体健康状况