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question 3

Alternative.
B. Classical.
Country.
D. Rock and roll.

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Dialogue Two question one

A. Making an attractive introduction.
B. Presenting the information.
C. Asking interesting questions.
D. Making a good preparation.

question two

A. Picking up a theme.
B. Delivering the presentation.
C. Designing a presentation.
D. Making a plan.

指状铣刀直径约为槽宽的______倍。

A. 1
B. 0.8
C. 0.5
D. 2

一棵无向树T有5片树叶、3个2度分支点,其余的分支点都是3度顶点,问:T有几个顶点_______。

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