单项选择题

Peter Sturrock thinks that the field of UFO study is in a state of ______.

A．popularization
B．pause
C．development
D．ignorance and confusion
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单项选择题
The scientist from the French space agency did all the following things except ______.
A．taking further photos
B．taking soil samples
C．planting vegetation in the soil
D．taking samples of vegetation
单项选择题
In the case that occurred in France in 1981, how many people witnessed it
A．One.
B．Two.
C．Three.
D．Five.
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