钩虫对宿主的最主要危害是()
A.皮炎
B.肠炎
C.肺部病变
D.异嗜症
E.贫血
参考答案:E
The young tennis player has often _____ famous players, but so far he has always been beaten.[ ]
A. competed for
B. competed over
C. competed with
D. competed in
下列哪些船舶需要登记?()
A、在中华人民共和国境内有住所或者主要营业所的中国公民的船舶。
B、军事船舶
C、中华人民共和国政府公务船舶和事业法人的船舶。
D、渔业船舶