与外源性抗原递呈密切相关的分子是()
A.MHCⅠ类分子
B.MHCⅡ类分子
C.FcγR
D.mlg
E.C3bR
参考答案:B
Beijing is in ______ north of China and Japan is ______ east of China. [ ]
A. a; on
B. an; of
C. the; to
D. /; to
— Li Lin hasn’t turned up yet, but he promised to come to the party.
— He ______ home. He is a man of keeping his word.
A.can’t leave
B.won’t be leaving
C.could have left
D.must have left