填空题
They are giant geometric patterns, which appear over-night in a field of crops. Many people believe that they are made by aliens. 31 "Crop circle", as the mysterious patterns are called, became a hot phrase this month.
32 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. 33 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. 34
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. 35
To date, thousands of circles have been discovered all over the globe, from the former Soviet Union to Japan to Canada.
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 worldwide.