2015-2016学年 外研版 必修三 Module 3 The violence of nature reading课件 (6)
2015-2016学年 外研版 必修三 Module 3 The violence of nature reading课件 (6)第5页

A tornado

1. A tornado is _____________________ from a thunderstorm to the ground. The most violent have winds of more than ____________ per hour. 2. They occur in the area of from __________________ to ________________________.

a rotating column of air

400 kilometres

Texas in the southeast

South Dakota in the north