单项选择题

Skilled computer criminals can break into a computer system______.

A．quite easily
B．without any risk
C．more easily than an armed robber can gain access to a bank vault and with far less risk
D．without being punished
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单项选择题
Computer criminals choose accumulating fractions of pence from individual payroll accounts because
A．it is very easy
B．employers are not concerned with pence
C．they can gain more
D．the accumulated value can be a useful gain, and it is not easy to be found
单项选择题
The text informs us that______.
A．Mental capacity is surely measured by education level
B．More-educated people never develop habits harmful to health
C．People should keeping stimulating the brain to bear more brain-tissue loss
D．We should take less adventuresome way to stimulate the brain
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