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师梦圆高中英语教材同步外研版选修9Reading and vocabulary下载详情
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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