单项选择题
A. 40 B. 400 C. 4,000 D. 40,000
A. Of course not. B. What’s wrong with you C. I’m so glad you could come. D. Yes, but why E. Just so-so. F. Thank you! G. But he panned to. H. Why don’t you...
A. weakened the reliability of reported sightings B. increased the number of UFO sightings C. allowed more scientific study of UFO’s D. solved the age-old mystery of UFO’s