单项选择题

A．The problem of the computer’s safe.
B．How does the virus work.
C．The computer and the viruses.
D．None of the above.
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单项选择题
A．Amino acid.B．Body’s natural rhythm.C．Exhaustion.D．Difficulty going to sleep.
A．Amino acid.
B．Body’s natural rhythm.
C．Exhaustion.
D．Difficulty going to sleep.
单项选择题
A．Because all the movies based on Tom Clancy’ books have been successful.B．Because there are complex characters in his books.C．Because all the people are crazy about his books.D．Because his chief character is a good, clean, honest family man.
A．Because all the movies based on Tom Clancy’ books have been successful.
B．Because there are complex characters in his books.
C．Because all the people are crazy about his books.
D．Because his chief character is a good, clean, honest family man.
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