Please give ______ some food to eat. They're hungry. [ ]
A. he
B. him
C. they
D. them
答案:D
若x-3y=-2,那么3-x+3y的值是( )。
以下哪些药物可用于弓形虫感染的治疗()
A.乙胺嘧啶
B.磺胺嘧啶
C.乙酰螺旋霉素
D.青霉素
E.克林霉素