单项选择题

In the case of vowel sounds, the ______ and the mouth cavities are changed by the shape and position of the tongue and lips.

A．nose
B．larynx
C．pharynx
D．uvula
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单项选择题
The Federal Government of the U.S. is divided into ______ branches.
A．2
B．3
C．4
D．5
单项选择题
In his novel, Robinson Crusoe, Daniel Defoe eulogizes the hero of the______.
A．aristocratic class
B．rising bourgeoisie
C．enterprising landlords
D．hard-working people
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