单项选择题

Continuous short buzzes on the telephone indicate that the line is busy after you dial the telephone number.

A．open
B．out of order
C．disengaged
D．in use
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A．cameraB．citeC．sceneD．site
A．camera
B．cite
C．scene
D．site
单项选择题
According to the passage, before the Ice Age the continental shelf was submerged in water.
A． Right
B． Wrong
C． Not mentioned
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