单项选择题

The main reason why business or government has not taken tough measures to stop hacking is that ______.

A．they will cost too much money
B．communication may be interrupted
C．hacking has not caused much damage
D．tough measures are illegal
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单项选择题
By saying Now exists the possibility of terrorism by computer , the writer means that ______.
A．some employees may erase information from payroll files
B．students who send out a "virus" may do damages to thousands of computers
C．some people may spread fear in public by destroying computer systems
D．some terrorists are trying to contact each other using electronic mails
单项选择题
He offered to ______ her a hand, as the suitcase was too heavy for her to carry.
A．help
B．show
C．lend
D．load
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