面粉中的碳水化合物主要是淀粉，约占（）由于面粉加工精度不同，不同碳水化合物含量有所差异。
参考答案：75%
— Must I take a bus?
— No, you _____ . You can walk there. [ ]
A. must not
B. don't
C. don't have to
D. had better
除AFP外，可以提高低AFP型肿瘤诊断率的是
A．PSAB．CEAC．SCCD．TAPE．AFF
