单项选择题

Listen to me and choose the word that you hear from what I say.

A．flog
B．flag
C．fog
D．frog

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It is not how much we do, but how much love we put in the doing. It is not how much we give, but how much love we put in the _______.

答案： giving

多项选择题

双子叶植物茎的初生结构包括( )。
A、表皮
B、皮层
C、基本组织
D、维管束
E、维管柱