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【单选题】
上消化道出血常见病因不对的是( )A.
食物中毒
B.
急性胃粘膜损害
C.
消化性溃疡
D.
胃癌
E.
食管胃底静脉曲张破裂
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【单选题】She is ________ newcomer to ________ chemistry but she has already made some important discoveries. [ ]
A.
the; the
B.
the; /
C.
a; /
D.
a; the
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