,either crescent-shaped(月牙形的）or disc-like,flying_______(52)the motion of saucer(碟)skimming(飞速掠过）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 manu 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 investigatons found no evidence of visitors from outer space.But that did not stop the true _____(56).The military were ____(57)up,they said .Or maybe it was because the travelers from space were of such superior intelligence ______(58)they could hide from military analysts(分析家）. People have always seenstrange lights in the sky .In the past these were explained in ____(59)ways.In a world where religion was less influential and science fiction was popular,signs from God were replaced by visitors from other ____(60). The date of the first UFO sightings was also significant.In 1947,World War II had just ended and the ___(61)War was just beginning.Humanity seemed locked in endless conflicts.Like generations before them,people looked ______(62)the skies for help.But instead of seeking God,they looked for help from super-intelligent aliens(外星人）with ____(63)technology.Belief in UFOs became the first riligion of science. However even people who believe in UFOs are not quite sure why they visit the earth.The universe is a big place and it is _____(64)to assume that there is life somewhere out there.It is pollible that alines have worked out how to travel through space.Yet some people report that they have been taken by aliens and have had experiments ____(65) on them.Why would anyone travel across half the universe to conduct medical experiments on people living in small towns in the United States?51 A see B look C seek D feel52 A below B before C under D with53 A ruled B bombed C visited D captured54 A attack B investigate C shoot D confront55 A written B said C told D known56 A thinkers B believers C followers D runners57 A covering B putting C cheating D tricking58 A which B what C that D this59 A funny B crude C foolish D religious60 A continents B planets C countries D regions61 A cool B nuclear C Cold D Star62 A to B above C at D up63 A traditional B backward C advanced D classical64 A unthinkable B impossible C unimaginable D reasonable 65 A studied B performed C brought D taken