Section C Directions: Read the passage below. Match the effects listed in the column on the right with their causes listed on the left by writing the appropriate letter in the space provided.(每个选项只能填一次) Tornadoes, or “twisters,” are among the smallest but most violent storms.They are caused by air masses that reach rotational speeds of about 300miles per hour. Tornadoes often occur in series, like the ones in April of 1965 that caused havoc in Iowa, Wisconsin, Illinois, Indiana, Michigan, and Ohio, killing 271 people and damaging $300,000,000 worth of property. Forty years earlier, in March of 1925, another series had killed 740 persons in Missouri, Indiana, Illinois, Kentucky, and Tennessee.“Tornado Alley” is a belt that runs through the Great Plains and southeastern portion of the United States. The Chicago area holds the greatest potential for tornado damage because of the combination of its location, its density of population, and its development. However, less populated southwestern Oklahoma has the highest incidence of tornadoes. Though Chicago has only half the incidence of tornadoes as Oklahoma, the need for disaster aid in Chicago is greater than anywhere else. Cause ______ 1. tornado series of 1965 Effect A. 740 people killed in 5 states B. smallest but most violent storms C. the greatest potential for tornado D. $300,000,000 property damage