单项选择题

As the mountains were covered with a __________ of cloud, we couldn't see their tops.

A．coating
B．film
C．veil
D．shade
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单项选择题
The magician made us think he cut the girl into pieces but it was merely an __________.
A．illusion
B．impression
C．image
D．illumination
单项选择题
Several guests were waiting in the __________ for the front door to open.
A．porch
B．vent
C．inlet
D．entry
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