单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Grocer.
B．Taxicab driver.
C．Carpenter.
D．Shoe maker.
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单项选择题
A．extendingB．illustratingC．performingD．conducting
A．extending
B．illustrating
C．performing
D．conducting
单项选择题
Which of the following can be implied according to the first paragraph
A．Security experts felt very strange about the crackers’ behavior.
B．Hackers often gain unauthorized access to computers.
C．Software is much better now than three years ago.
D．Credit cards, which are worth 1 million, have been stolen.
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