[单项选择]
Where Have All Our Visitors Gone
Sixty years ago, a man named Kenneth Arnold saw something that people are still
(51) today, something that changed popular culture for ever.
Flying his plane over mountains in the US state of Washington, he saw a line of strange objects, either crescent -shaped or disc-like, flying
(52) the motion of a saucer skimming on water.
The media soon picked up on the story--the Flying Saucers were here! Was the earth being
(53) by creatures from another planet Soon, so many sightings were made that the US military began to
(54) . It called these strange objects UFOs Unidentified Flying Objects, and that is how they are
(55) today.
Military investigations found no evidence of visitors from outer space. But that did not stop the true
(56) . The military were
(57) up, they said. Or
(58) it was because the travelers from space were of
A. named
B. called
C. known
D. dubbed
