胃癌、食道癌发生淋巴结转移时常出现在( )
A.右锁骨上窝B.滑车上C.左锁骨上窝D.腋窝E.颈部
参考答案:C
There is no way of knowing why one man makes an important discovery ______ another man, also intelligent, fails.
A.since
B.if
C.as
D.while
学生:大学生
A.同学:朋友
B.学历:本科
C.足球教练:教练
D.硕士:博士