单项选择题
A．the effect of smoking among children B．the difficulty in preventing children from smoking C．the reasons why children start smoking among children D．the measures to ban smoking among children
A．man possesses far more senses than the five major ones B．man possesses a few more senses than animals C．man possesses as many senses as animals D．man has fully utilized his senses
A．Man is more colour-conscious than the honey-bee. B．The honey-bee is blind to red. C．The honey-bee can see far more colours than man. D．Man is sensitive to the ultra-violet.