【单选题】In the 1970s, the Surgeon General office's investigation suggested that television violence was unrelated to aggressive behavior in some children.
【单选题】1 It's been 40 years since the surgeon general issued the first report warning that cigarettes cause cancer. Since then, the public has grown acutely aware that smoking is lethal. But though the publi...
A.
Quite a big percentage of Americans are cigarette smokers.
B.
Americans are well informed of the danger from smoking.
C.
Smokers of cigarettes may die of cancer.
D.
The campaign against smoking succeeds in preventing Americans from smoking.