单项选择题

Which of the following is true of the sand-buried landscape

A．It was an old avenue.
B．It was an underground river.
C．It was shaped by flowing water.
D．It was shaped by the old Nile River.

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单项选择题

Which of the following is NOT mentioned in the passage as an instance of attack by a hacker

A．Deleting information in the computer's memory.
B．Shutting down the computer whenever he wishes.
C．Entering your house to steal.
D．Spoiling a system for air traffic.

单项选择题

According to the passage, which of the following statements is NOT true

A．Hacking is also known as computer break-in.
B．Experts on computer networks consider hacking nothing serious.
C．Hacking is a widespread concern.
D．Hacking is potentially disastrous.

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