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
A．stationsB．lotsC．enclosuresD．fields
A．stations
B．lots
C．enclosures
D．fields
单项选择题
A．affirmB．assertC．discoverD．declare
A．affirm
B．assert
C．discover
D．declare
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