問題詳情

＜D＞ Tornadoes come in many shapes and sizes, but most of them take on the 48 of a narrow funnel. Theyusually do not last long. 49 , they may inflict considerable damage because they occur with little or nowarning and their paths are unpredictable. Tornadoes vary in intensity from F0 to F5 on the Fujita scale regardlessof shape and size. Sixty-two percent of tornadoes are weak (F0 to F1) with a maximum wind speed less thanabout 50 mph and they cause only minor damage, while some are strong tornadoes with wind speed up to 300mph. They bring not only death but also destruction. For instance, a strong tornado that struck the central U.S. inMay 1996 was reported to 50 at least 49 dead and 30,000 50 . Since tornadoes can be very destructive,in order to understand tornadoes better, scientists have developed special vehicles and weather-monitoringequipment that 51 them to make close-up observations of these dangerous storms. Radar equipment is put ontrucks and driven near a tornado, 52 it records wind speeds and other weather data. Scientists often have todrive the radar hundreds of miles to chase down a tornado—a job that can be quite dangerous!
48.
(A) phenomenon
(B) degree
(C) identification
(D) appearance

參考答案

答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)

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