主要用于疟疾预防的抗疟药是()
A.氯喹
B.喹碘方
C.伯氨喹
D.甲硝唑
E.乙胺嘧啶
参考答案:E
若角α是第二象限角,则点(sinα,cosα)在第 ______象限.
They often send emails and ______ to me on the Internet. [ ]
A. photoes
B. photos
C. photo's
D. photo