What do you usually do _____ the evening after supper? [ ]
A. on
B. at
C. of
D. in
答案:D
免疫缺陷病的英文缩写是()
A.AID
B.IDD
C.PIDD
D.SIDD
E.AIDS
抑制细菌DNA合成的药物是()
A.青霉素G
B.磺胺甲恶唑
C.头孢他啶
D.环丙沙星
E.灰黄霉素