Here is a riddle. I am suspended in the air, I touch nothing, and I am surrounded by lights. Now I dress myself afresh, and now I am naked, and I am in the heat and the cold, by night and by day. Everyone amuses himself by tramping upon me, even the animals abuse and scorn me, and yet I have such treasures hidden in my bosom that he who finds them I can make full of happiness. What is the answer to the riddle

单项选择题A postman delivers mail round a housing estate. He does not want to visit the same street more than once, but can pass over the same street corners. On which housing estate is this possible

单项选择题A．It should be done because TV shows too much violence. B．It is neither necessary nor possible. C．It might not be workable, but we should not overlook the danger of TV. D．It should be done as soon as possible.

单项选择题A．They will feel pain all over.B．They may think about killing themselves. C．They will not go to school or work. D．No one can help these people.

单项选择题A．Recognize the educational merits of the medium. B．Ban TV advertising aimed at younger people. C．Prohibit teenagers from watching TV. D．Help older people survive the “television experience”.

单项选择题A．Having more sleep.B．Eating less.C． Trying to put on weight.D．Seeing a doctor.