单项选择题

The fact that the earth's surface heats ______ provides a convenient way to divide it into temperature region.

A．infrequently
B．irregularly
C．unsteadily
D．unevenly
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单项选择题
If a cat comes too close to its nest, the mockingbird ______a set of actions to protect its offspring.
A．hastens
B．releases
C．devises
D．initiates
单项选择题
Scientists are searching for the oldest tree______ because it can teach them a great deal about many issues related with climate change.
A．lively
B．alive
C．living
D．live
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