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选修9《Reading and vocabulary》新课标PPT课件优质课下载
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Passage Structure
Computer viruses
Computer viruses have done great damages in the past few years.
The next virus would be worse.
Computer viruses are threatening.
Para 1-2
Para 3-6
Para 7
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Part1
a programme
enter a computer
damage or destroy
make copies of itself
threatening and dangerous
A computer virus
Part2
Time
virus
influence
The Melissa virus
the business world
The Chernobyl virus