急性脊髓炎最常见的受累部位在（）。
A.T3～T5
B.C3～C5
C.L3～L5
D.T10～T12
E.L1～L2
参考答案：A
They are very familiar with this kind ofbusiness, so there's no need to be______about the outcome. [ ]
A. enthusiastic
B. optimistic
C. concerned
D. controversial
