单项选择题

With the help of the space-shuttle-carried radar, archeologists found

A．a new stretch of the Sahara desert.
B．traces of ancient riverbeds under the Sahara Desert.
C．some traditional archeological tools in the Sahara Desert.
D．a mountain beneath the Sahara Desert.

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热门试题

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.

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.