噪声对人体的影响:噪声():长期接触80dB以上的噪声,听力就有可能受到损害,在大于85dB的噪声环境中工作;噪声对()
参考答案:对听力的影响;人的生理和心理的影响
-Has your father returned from Africa yet?
-Yes,but he __________here for only three days before his company sent him to Australia.
[ ]
A. was
B. has been
C. will be
D. would be
用于控制良性疟复发和传播的药物是
A.伯氨喹B.氯喹C.奎宁D.乙胺丁醇E.青蒿素