单项选择题

Which of the following possibilities is NOT mentioned（）

A．The UFO was from outer space.
B．The UFO was another plane.
C．The UFO was an unusual effect of light.
D．The UFO was Venus.

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单项选择题

According to the passage, the writer probably means to say that（）

A．UFO doesn't really exist
B．UFO is really unidentified
C．UFO comes from outer space
D．UFO is only people' s imagination

单项选择题

I don't know what they are but I' ve got an open mind on them (in the second paragraph) probably means that（）

A．he believes the UFO comes from outer space
B．he disbelieves the UFO comes from outer space
C．he neither believes nor disbelieves that the UFO comes from outer space
D．he agreed with most of the people