单项选择题

以下不属于无限联结的工具是（）。

A.重述问题
B.随机输入法
C.思维导图
D.拼图游戏

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单项选择题
（） is the oldest and fastest-growing form of e-commerce, which allows e-business to collaborate, partner, and share research and complex data with other businesses.

A.B2B
B.C2C
C.B2C
D.C2B
单项选择题
In the initial stage of Alibaba, the （） threshold was taken to attract companies for free membership.

A.slow
B.fast
C.high
D.low
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