单项选择题

幼儿园促进幼儿社会性发展的主要途径是（）。 A.
人际交往 B.
操作练习 C.
教师讲解 D.
集体教学

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3. The reason why emerging company Taobao could defeat the powerful eBay was due to the use of the indirect method. It captured the customer's psychology, identified the opponent's weakness, and adopted the free model, which was opposite to that of eBay. (

答案：正确

单项选择题

在图示四种应力状态中，只产生形状改变比能的是。

A、A
B、B
C、C
D、D