对疑似甲类传染病人在明确诊断前，应在指定的场所进行（）。
A.医学观察
B.留验
C.隔离
D.访视
E.就地诊验
参考答案：C
—Where's Lucy?
—I'm not sure. She ________ in the school library. [ ]
A. maybe
B. must be
C. may be
D. will be
半水平排列
