—Where is Bob ?
—He has ______ Shanghai . [ ]
A. gone to
B. been to
C. been in
D. gone in
A
高压加热器为什么要装注水门?
间歇热最常见于下列哪项疾病()。
A.大叶性肺炎
B.重症肺结核
C.疟疾
D.布鲁菌病
E.伤寒