单项选择题

Experts urge a reforesting of cleared areas, promotion of reduced-impact logging, and _____________ agriculture, to maintain the rain forest.

A．sustainable
B．renewable
C．revivable
D．merchandisable
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单项选择题
In a stark _________ of fortunes, the Philippines – once Asia’s second richest country – recently had to beg Vietnam to sell its rice for its hungry millions.
A．denial
B．reversal
C．interval
D．withdrawal
单项选择题
Under an unstable economic environment, employers in the construction industry place great value on ___________ in hiring and laying off workers as their volumes of work wax and wane.
A．flexibility
B．morality
C．capacity
D．productivity
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