人类MHC基因位于第几对染色体上( )
A．第1对
B．第6对
C．第9对
D．第12对
E．第19对
参考答案：B
——Can I really get a mountain bicycle as a reward if I win the race?
——Absolutely!
A．It all depends
B．I mean it
C．You’ve got me
D．So Will you
