单项选择题

Countless billions of ______ sea creatures and plants lived and sank to the sea bed.

A．second
B．minute
C．hour
D．day
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单项选择题
The spring of last year witnessed the ______ of the strange weather.
A．adaptation
B．shift
C．vicissitude
D．kaleidoscope
单项选择题
The basic ______ of their philosophy is that everyone should be free to do as they please, as long as they do not harm others.
A．requisite
B．conception
C．premise
D．opinion
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