Would you like __ computer games?[ ]
A. play
B. playing
C. to play
答案:C
若|x﹣y+2|与(x+y﹣1)2互为相反数,则x=( ),y=( ).
克雷伯杆菌肺炎治疗时首选哪种药物为佳()
A.氨基糖苷类
B.大环内酯类
C.青霉素类
D.喹诺酮类
E.磺胺类