听力原文:Steven, what's your idea of the price?
(A) It's a marvelous idea.
(B) The best we can do is $50 per case.
(C) I think we deserve it.
(37)
A.
B.
C.
第10题
某二叉树有5个度为2的结点,则该二叉树中的叶子结点数是______。
A.10
B.8
C.6
D.4
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