单项选择题

This article deals with the natural ________, which is most interesting to everyone.

A．phenomenas
B．phenomenons
C．phenomena
D．phenomenon
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单项选择题
Jack answered all the questions ________ one.
A．conserve
B．keep
C．rescue
D．save
单项选择题
When I was in Los Angeles, I spent ________ day in his home.
A．plenty of
B．a great many
C．many a
D．much
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