单项选择题

There have been UFO reports for ______.

A．15 years
B．50 years
C．six decades
D．four decades
<上一题 目录 下一题>
热门 试题

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
相关试题