单项选择题

There are a number of (reason) why population (is concentrated) in the regions, but the wide variety and (availability) of animal and vegetable life may be (the most important).（）

A.reason
B.is concentrated
C.availability
D.the most important

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单项选择题
An American expects (his or her) conversation partner (to respond) a statement (immediately), but (in some other) cultures, people leave silence between each statement.（）

A.his or her
B.to respond
C.immediately
D.in some other
单项选择题
If you are smiling, your voice on the phone will automatically be friendly.（）

A．habitually
B．naturally
C．suddenly
D．particularly
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