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Crop Circle Mysteries
They are giant geometric patterns，which appear over-night in a field of crops.Many people believe that they are made by aliens.______(1)______ “Crop circle”，as the mysterious patterns arc called，became a hot phrase this month.
______(2)______ It’s believed to be the world’s first three-dimensional crop circle1.The giant crop circle gives an impression of looking down on skyscrapers from above.______.(3)______ Crop circles were first widely noticed in the late 1970s as many mysterious circles began appearing in crop fields throughout the English countryside.People were intrigued by these giant patterns.They were huge (at least tens of metres in diameters) and popped up over-night2.______(4)______
Various scientific and pseudo-scientific explanations were put forward to explain the phenomenon.Some hold that they were left by alien spaceships.Others say that they are simply an elaborate prank3.______(5)______ To date，thousands of circles have been discovered all over the globe，from the former Soviet union to Japan to Canada.
