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【多选题】
下列属于红葡萄品种的是。A.
蛇龙珠
B.
黑比诺
C.
辄
D.
雷司令
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【单选题】Teaching is supposed to be a professional activity requiring long and complicated training as well as official certification. The act of teaching is looked upon as a flow of knowledge from a higher so...
A.
The author believes that it is not difficult to be a good teacher.
B.
The author believes that every person has the potential to be a teacher.
C.
The author believes that teaching is a professional activity requiring special training.
D.
The author believes that teaching is the flow of knowledge from a higher source to an empty container.
【简答题】淡水生物有哪些生态类群?各有何特点?
【简答题】不能被吸收的糖类，包括粗纤维，果胶等，总称()。