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光学投影类媒体包括幻灯、投影和电影媒体等。()

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一些危险性、不易或不宜真实接触的必修教学内容与学习内容可以用创设模拟现实情境来满足教与学的需求。()

It’s time that we __ to take care of our own house

A. Begin
B. Will begin
C. Have begin
D. begin

彩色电视机的制式尽管不同，但是可以互换使用。()

By the end of next month, you __ here for three years.

A. Will have studied
B. Study
C. Will study
D. Have studied