单项选择题

In parts of the Arctic, the land grades into the landfast ice so ______ that you can walk off the coast and not know you are over the hidden se

A． permanentlyB. imperceptiblyC. irregularlyD. precariously
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单项选择题
After thirty years of television, people have become speed watchers . Consequently, if the camera lingers, the interest of the audience ______.
A．broadens
B．begins
C．varies
D．flags
填空题
brush
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