关于早期胃癌的描述,正确的是()。
A.局限于胃壁内
B.局限于黏膜及黏膜下层
C.直径在Zcm以内
D.无淋巴结转移
E.尚未侵及浆膜层
参考答案:B
肝外胆道包括:()① 胆囊、胆囊管;② 肝总管;③ 胆总管;④ 胰管
A.①②③
B.①③
C.②④
D.④
E.①②③④
It was not until the age of 60 ______ William Steig discovered his talent for writing children’s books.
A.after
B.that
C.since
D.when