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填空题

【参考答案】

severe→several
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填空题∧ troubled→been

填空题recognized→admitted

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

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

填空题five-year