单项选择题

What is not mentioned when the man is giving advice on hair care

A．Eat a balanced diet.
B．Shampoo hair frequently.
C．Dry hair gently with a towel.
D．Stop using the hair dryer.
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单项选择题
Under what circumstance the computer criminals may escape without detected according to the author in the second paragraph
A．If they hooked to computer anonymously.
B．If they are clever enough.
C．If they know how to operated computer.
D．If no one checks up on what the computer is doing.
单项选择题
The passage is mainly about______
A．why computer criminals are often able to escape punishment
B．why computer crimes are difficult to detect by systematic inspections
C．how computer criminals manage to get good recommendations from their former employers
D．why computer crimes can' t be eliminated
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