单项选择题

Is there any()they’ll ever find a cure for the common cold

A. prospective 
B. prospect 
C. prosperity   
D. prosperous

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She agreed without the slightest()

A. hesitation  
B. thinking
C. look     
D. hope
单项选择题
The number of children()from 1 to 15 in different families.

A. varies    
B. seems  
C. changes   
D. turns
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