颅内转移瘤来源最常见为()
A.肺部
B.肝脏
C.泌尿系统
D.胃肠
E.皮肤及骨骼
参考答案:A
解析:颅内转移瘤以肺癌最多见,国内外统计来源最多的均为肺癌。
--- It’s difficult for the village children to cross the river for school.
--- I think a bridge ________ over the river.
A.should be built
B.is being built
C.has been built
D.was built
《国语》的文学成就有哪些?