具有抗疟作用的成分是
A．大黄素
B．青蒿素
C．紫杉醇
D．梓醇
E．大青素
参考答案：B
—How many members are there on the team?
—Eight this term. But there will be ten _____ next term. I'm not quite sure.[ ]
A. at all
B. at last
C. at least
D. at once
神经梅毒首选治疗药物是（）
A.青霉素G
B.头孢曲松钠
C.多西环素
D.头孢噻肟
E.氯霉素
erm. But there will be ten _____ next term. I'm not quite sure.[ ]