题目

People are being tricked into Facebook with the promise of a fun, free service without realizing they’re paying for it by giving up loads of personal information. Most Facebook users don’t realize this is happening. Even if they know what the company is up to, they still have no idea what they’re paying for Facebook because people don’t really know what their personal data is worth. The biggest problem, however, is that the company keeps changing the rules early on you keep everything private. That was the great thing about Facebook. You could create your own little private ne取一盛有水的圆形玻璃杯,将手紧靠在杯的背面.透过水杯看到手变大变大(“变大”、“变小”、“不变”).这是因为盛水的圆柱形玻璃杯相当于一个凸透凸透镜,手紧靠水杯的背面时,物距小于小于焦距(“大于”、“小于”).根据凸透镜成像规律,此时可在同侧成正正立放大放大的虚像.
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