What does the phase 'look over their shoulders' ( Lines 1~2,Para.2) mean?
A．Have an eye on what students are talking about online.
B．Pretend not to see anything when students need help.
C．Limit their rights of talking freely online.
D．Have routine checks at school.

未分类题Whats the main idea of this passage?A．Police are making use of the Internet to maintain good public order.B．Students should learn to protect their privacy online.C．Social networking websites have bad influence on high school students.D．Parents should take control of what their children are doing online.

未分类题For what was the Rockefeller Drug Laws criticized?A．They would be costly and ineffective according to past experience.B．It was the first time that drug laws had been passed in the U.S.C．They deprived the judges of their right to sentence with their own will.D．It would be better to send drug users for treatment instead to jail.

未分类题He showed great interest in my field of work. He asked me______fresh developments.A．informing him ofB．to inform. himC．to keep him informed ofD．keeping him informed of

未分类题The box is______.A．too heavy that I cannot lift itB．too heavy for me to liftC．so heavy for me to liftD．too heavy for lifting

未分类题The gray building is where the workers live, and the white one is where the spare parts______.A．are producingB．are producedC．producedD．being produced