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.
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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.
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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