单项选择题

The volcanic eruption of Mount Pinatubo in 1991 blew a gigantic amount of sulfates into the stratosphere.

A．mighty
B．wonderful
C．colorful
D．colossal
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单项选择题
When these occur, we tend to resort to background tendencies and habits to justify our behavior.
A．fall back on
B．come up with
C．live up to
D．give way to
单项选择题
With adequate support and insight, all teachers can be active participants in excellent professional development.
A．elusion
B．vision
C．respect
D．rejection
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