抑制细菌细胞壁合成的药物是()
A.头孢菌素
B.氨基糖苷类药物
C.磺胺类药物
D.甲氧苄啶
E.大环内酯类药物
参考答案:A
The girl has a sweet ___________. She sings very well.
A. voice B. noise C. sound
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