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1.设备无关性的基本含义是指应用程序中所用到设备不局限于使用某个具体的物理设备（）。

A. 对
B. 错

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哪3种I/O控制方式

A. 对
B. 错

Teachers ask college students to take as many ________ as possible.

A. activity
B. activities
C. actions

Knowing how to plan your time can be one of the _______challenges during your time in school.

A. big
B. bigger
C. biggest

Not only learning but also _________ experience is important for college students.

A. social
B. society
C. socialism