Unit 6 Disaster and Hope-【新课程能力培养】2023-2024学年新课程高一英语阅读必修第三册（外研版）

Unit6 语篇类型： 说明文； 主题语境： 人与自然。 龙卷风在美国。 词数： 311 难度： 中 建议用时： 7′ 实际用时： TheUnitedStateshasmore tornadoes thananyother country in theworld. In a normalyear, thereare800to1,000tornadoes.Mosthappen in themiddlepartof the country. Tornadoes form when warm and cool air meet. In theMidwest, the warm airfromtheGulfofMexicooftenmeets thecoldairfromCanada. The usual tornado season isMarch throughMay. Tornadoes formmost often in the afternoon and early evening. There is often nowarning of a tornado. Peoplewho live in theMidwestknowthesignsof tornadoactivity.Theskybecomesdark,oftena greenish color. Dark clouds appear in the sky and there is often large hail （冰雹 ） . Suddenly, thereisa loudsound, likea trainora jetplane.Sometimes, two, three, five, tenormoretornadoescanformoveralargearea. This type of tornado activity hit Oklahoma and Kansas inMay 1999. The day was stormy, with heavy thunderstorms in the afternoon. As the storms continued, tornadoes began to form. Dozens of tornadoes hit towns and neighborhoods in Oklahoma, then inKansas. Some stayed on the ground for several hours, destroying everything they touched. The tornadoes killed 43 people and injured 600 others. They destroyed thousands of homes and businesses. In some areas, not one home stood. In other areas, the tornadoes destroyed every home on the left side of the street, but didn蒺t touch any homes on the right side. In other areas, the tornadoes lifted people and cars into the air and then threw them back down to earth. So it is important to know where to hide and how to protect yourself in the face of a A Unit 56 61 必修 第三册 tornado. （ ） 1.Whatcanwelearnabout tornadoesinAmerica? A.Theymayappear ingroups. B.Theyusuallyhappeni