分枝杆菌的细胞壁结构中含量最多的固体成分是（）
A.糖类
B.脂类
C.蛋白质
D.水
E.固醇类
参考答案：B
还原血红蛋白超过多少出现发绀（）
A.10g／L
B.20g／L
C.30g／L
D.40g／L
E.50g／L
7. ---________ do you think of the play we saw just now?
---Wonderful! But not as interesting as the one we saw last Saturday.
A．What
B．How
C．Why
D．Where
