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
If you are smiling, your voice on the phone will automatically be friendly.（）

A．habitually
B．naturally
C．suddenly
D．particularly
单项选择题
The foreign teacher readily accepted his students' invitation to go for a picnic.（）

A．willingly
B．reluctantly
C．eagerly
D．entirely
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