环境中常见的二次污染物如（）
A.SO2和NOx
B.二恶英和甲基汞
C.甲基汞和光化学烟雾
D.NOx和酸雨
E.多环芳烃和二恶英
参考答案：C
医学伦理学的中心范畴是()
A．医德良心
B．医德荣誉
C．医德义务
D．医德功利
E．医德认知
In the global economy, a new drug for cancer, _________ it is discovered, will create many economic possibilities around the world.
A．whatever
B．whoever
C．wherever
D．whichever
