A、<img src="http://img.wangxiao.cn/examfiles/imgcache/attached/image/20140605/20140605160657_5676.png" alt="" />

B、<img src="http://img.wangxiao.cn/examfiles/imgcache/attached/image/20140605/20140605160706_5530.png" alt="" />

C、<img src="http://img.wangxiao.cn/examfiles/imgcache/attached/image/20140605/20140605160717_7102.png" alt="" />

D、<img src="http://img.wangxiao.cn/examfiles/imgcache/attached/image/20140605/20140605160727_1641.png" alt="" />