与胸膜间皮瘤发病有关的因素是（）
A.吸烟
B.大气污染
C.石棉
D.单纯疱疹病毒
E.亚硝酸铵
参考答案：C
It is shown that men have _____ as women do on average while driving according to recent statistics. [ ]
A. twice as many serious accidents
B. serious accidents as twice many
C. twice serious accidents as many
D. serious accidents as many twice
党的公安政策指明了公安机关及其人民警察从事工作的基本方向、基本要求和基本做法．( )
