单项选择题

Grey whales have long been ______ in the north Atlantic and hunting was an important cause for that.

A．deprived
B．extinct
C．detained
D．extinguished
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单项选择题
Psychologists suggest that children who are shy are more ______ to develop depression and anxiety later in life.
A．engaged
B．eligible
C．prospective
D．prone
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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