记存模型要求准确、完整，但不包括 （）
A.基骨
B.移行皱襞
C.腭穹隆
D.唇系带
E.颊黏膜
参考答案：E
It ____ Jim and his wife who gave me help when I was in trouble. [ ]
A. were
B. was
C. are
D. is
细菌对氨基苷类抗生素形成耐药的主要原因是（）
A.细菌产生了水解酶
B.细菌产生了钝化酶
C.细菌膜通透性改变
D.细菌代谢途径的改变
E.与细菌致死靶位亲和力降低
