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单项选择题

There have been UFO reports for ______.

A．15 years
B．50 years
C．six decades
D．four decades
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单项选择题In which countries are there programs of pursuing UFO

A．China and USA
B．Chile and France.
C．France and Canada.
D．Egypt and Greece.

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

单项选择题Which of the following is NOT true

A．In the days before the vote, the Clinton Administration had been careful to describe the referendum as an internal matter.
B．It is critical for the United States to have a stable northern neighbor.
C．Mr. Clinton discussed the outcome of the referendum Tuesday with Canadian Prime Minister.
D．Both pacts will be discussed further with united Canada.

单项选择题The recent fire-related accidents were caused by ______.

A．strong winds and lack of water
B．rapid economic growth
C．locked doors and windows
D．overcrowded people