A. He finds his history book difficult to understand. B-找考题网

单项选择题

A. He finds his history book difficult to understand.
B. He has to read a lot of history books.
C. He doesn’t like the history course.
D. He has lost his history book.

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There is evidence that unscrupulous experts can also earn serious money from crime business group by breaking into computer systems, writing viruses and（）

单项选择题

What is the main purpose of this article（）

A. To introduce different kinds of computer viruses and their harms.
B. To teach people how to guard against computer viruses.
C. To briefly introduce the history of computer hackers and viruses.
D. To compare the degrees of harms from various computer viruses.

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