填空题

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. (46) . "Crop circle", as the mysterious patterns are called, became a hot phrase this month.
(47) . It’s believed to be the world’s first three-dimensional crop circle. The giant crop circle gives an impression of looking down on skyscrapers from above. (48) . 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 meters in diameters) and popped up over-night. (49) .
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 prank. (50) . To date, thousands of circles have been discovered all over the globe, from the former Soviet Union to Japan to Canad

• a.A. A strange pattern 360 feet (110 meters) in diameter was discovered earlier this month in a wheat field in Oxfordshire, England.B. Others call them hoaxes.C. No one knew how or by whom they were made.D. The design’s discovery immediately generated a new tide of public interest in this mysterious phenomenon.E. Farmers often make crop circles for fun.F. But rather than discovering the truth, people saw increasingly complicated circles appear worldwid