题目内容

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