单项选择题

Which of the following best summarizes the main information of the passage

A．High-tech helps locate many fascinating archeological sites.
B．Without high-tech, the archeologist's work would come to a stop
C．High-tech is has taken the place of shovels and picks.
D．High-tech makes the archeologist's work more fruitful.

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单项选择题

The stream-rounded pebbles and Stone-Age axes which were found along the ancient river banks show that

A．an early human civilization once existed along the old river banks.
B．ancient people didn't know how to make weapons.
C．most species of animals in Sahara have disappeared.
D．early humans were good at fighting with sharp weapons.

单项选择题

They in the second line of the last paragraph refers to

A．old New England fences.
B．the stretch of walled fields.
C．the expedition members.
D．ancient villages.