A．Three-thirty. B．By gate 12. C．A moment ago. D．At the Bus Station.
单项选择题1（）
A．About 50 pages. B．It is very long. C．About 2 hours. D．It is 2 hours.
单项选择题Compared with nonsmokers' children, the children whose parents both smoke are likely to （）.
A．grow up more slowly B．be sick under the age of five C．develop lung cancer more often D．become smokers more easily
