It is suggested in the fourth paragraph that comprehensive sex education A．does not put off sexual activity among the teens. B．helps the teens reduce the risk of becoming pregnant by 50%. C．helps 50% of the teens avoid the sexual behavior. D．helps the teens avoid becoming pregnant more effectively.
A.does B. B．helps C. C．helps D. D．helps E.
【参考答案】
D 事实细节题，考查比较细节。第四段指出“与接受唯禁欲教育的学生相比，接受综合的性教育的青少年怀孕风险要低50％......