单项选择题

Climate change was probably important in both ______ and evolution of dolphins.

A. execution
B. extinction
C. exclusion
D. excavation
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单项选择题
He seemed to be a lot more cheerful and appeared to ______ from his bout of depression of the previous evening.
A. be recovered
B. have recovered
C. be recovering
D. having recovered
单项选择题
Reforms of this kind would go further towards making the welfare system more redistributive than any ______ changes in the structure of services or benefits.
A. likely
B. prone
C. apt
D. liable
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