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Asfor water, there was a choice: we could drink_______________, ordie of thirst.

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What students can do?Computers:Use computers during lecture, but only to 1. _____ 2._____.Cell phones:Put cell phones 3.______ .

What students can’t do?Computers:Watch 1._______ 2.______.Cell phones: Send or read 3._____ 4.______ or look at Facebook.

Consequences of breaking rulesComputers:Students won’t be allowed to use computers for the 1.________ of the semester.Cell phones:The professor will 2.______ the cell phone and 3.______ until the end of class.

形成投影的三要素有( )、物体和投影面。

A. 投影屏
B. 投射线
C. 光源
D. 实体

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