单项选择题

A．scarce
B．risky
C．rare
D．rigid
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单项选择题
A．backgroundB．situationC．circumstanceD．condition
A．background
B．situation
C．circumstance
D．condition
单项选择题
A．speciallyB．naturallyC．particularlyD．fortunately
A．specially
B．naturally
C．particularly
D．fortunately
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