Tornadoes（龙卷风） are one of the worst weather events on earth．Each year，tornadoes kill many people．The storms often carry homes，cars and trees from one place to another．And they can also destroy anything when they pass by．A tornado es from a thunderstorm（雷雨） in the sky down to the ground．It is big at the top and small at the bottom．A tornado appears when winds in different directions meet in the cloud and begin to turn in circles．People can see tornadoes almost everywhere in the world．But most happen from late winter to middle summer．There is a second high season in November．During spring，warm air moves north and mixes with the cold air left from winter．In November，the opposite happens．Cold air moves south and mixes with the warm air left from summer．Tornadoes always e suddenly．Weather scientists have done something to predict（预测） tornadoes．But the storms often move too fast for people to protect themselves．Last year，tornadoes killed more than one hundred people in United States．Scientists say the best place to be in is a small room，without windows，in the middle the lowest part of a building when tornadoes e．根据短文内容，选择最佳答案．66．According to the passage，we know the shape of the tornadoes may be like___．67．In the United States，most tornadoes happen___．A．from late summer to middle summerB．from late autumn to middle winterC．from late autumn to middle springD．from late winter to middle summer68．According to Paragraph 4，tornadoes appear when___．A．warm air and cold air mixB．cold air and cold air mixC．warm air and warm air mixD．warm water and cold water mix69．What's the Chinese meaning of the underlined word"destroy"？___A．保护B．珍惜C．毁灭D．惩罚70．From the passage，we know that___．A．the United States has very few tornadoesB．tornadoes are one of the worst weather events in the worldC．people should stay in big rooms with windows when tornadoes eD．more than one thousand people were killed by tornadoes in the USA last year． 英语
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【答案】 66．B．推理判断题．根据第二段描述It is big at the top and small at the bottom．可知龙卷风顶部大，底部小，结合图片，故选B．67．D．细节理解题．根据第三段But most happen from late winter to middle summer．可知发生的时间是从晚冬到盛夏这段时间里，故选D．68．A．细节理解题．根据Cold air moves south and mixes with the warm air left from summer可知是冷暖空气混合形成龙卷风，故选A．69．C．词义猜测题．根据Each year，tornadoes kill many people．The storms often carry homes，cars and trees from one place to another．And they can also destroy anything when they pass by．可知每年，龙卷风杀死许多人．他们经常把房子，汽车和树木从一个地方刮另一个地方．可以推测他们也可以摧毁任何东西．故选C．70．B．推理判断题．根据Tornadoes（龙卷风） are one of the worst weather events on earth，可知龙卷风是地球上最恶劣的天气事件，所以tornadoes are one of the worst weather events in the world正确．故选B．