单项选择题

The developing nations want rich countries to help shoulder the cost of ______ forests.

A．constructing
B．conserving
C．upgrading
D．updating
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单项选择题
Habits acquired in youth-notably smoking and drinking-may increase the risk of ______ diseases in a person’s later life.
A．cyclical
B．chronic
C．critical
D．consecutive
单项选择题
After the earthquake, a world divided by ______ and religious disputes suddenly faced its common humanity in this shocking disaster.
A．epidemic
B．strategic
C．ethnic
D．pathetic
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