皮皮学，免费搜题
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【单选题】
本病最主要的病因为A.
亚硝胺类化学致癌物
B.
病毒性肝炎
C.
嗜酒
D.
遗传
E.
吸烟
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反馈参考答案：
举一反三
【简答题】Schreib mir bitte, wie du die Winterferien ____hast.
【单选题】Real competition can happen only when ______.
A.
academic standard is improved
B.
there are comparable schools with different educational qualities
C.
students have different interests
D.
schools of all areas have sufficient budget for their development
【单选题】Michael put me in a ______ position when we talked about the matter that day.
A.
real difficulty
B.
really difficulty
C.
really difficult
D.
real and difficult
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