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
If a substance is dissolved in water or heated, it may ______ a gas.
A. give away
B. give in
C. give off
D. give back
单项选择题
Everything in the universe undergoes ______ development and change.
A. continuous
B. continual
C. continued
D. constant
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