根据燃料性质和大气污染的组成,大气污染可分为()
A.煤炭型大气污染
B.石油型大气污染
C.混合型大气污染
D.特殊型大气污染
E.氧化型大气污染
参考答案:A, B, C, D
为诊断艾滋病,还应询问下述病史,除了
A.反复输血史
B.蚊虫叮咬史
C.静脉吸毒史
D.同性恋
E.双性恋
George's records _______ very successful after the Beatles. [ ]
A. was
B. were
C. are
D. is