Questions 11—13 are based on the following passage. You now have 15 seconds to read Questions 11—13. In the USA, how many children smoke every day

A．Because small children are more curious about cigarettes.
B．Because smoking is difficult to give up for children.
C．Because the early age is the time to form values.
D．Because children’s health is more venerable to the hurt of cigarette.

A．Because people expose too much to the computer.
B．Because people don’t care about the low levels of radiation.
C．Because the cells are killed by radiation.
D．Because the cells produce themselves in an unusual way.