发布时间：2016-03-18 来源：新东方在线 发布人：wyznl
People are becoming very aware of the dangers of secondhand smoke. ________.
A、As a result, they have passed laws which prohibit people from smoking in many public places.
B、This smoke is called secondhand smoke.
C、It is even harder for children to avoid secondhand smoke.
D、Scientists did not think that these chemicals could harm a nonsmoker’s health.