一个强烈的风暴系统星期日 (12月29日)威胁在美国东南部部分地区引发龙卷风，而前一天的恶劣天气导致龙卷风袭击德克萨斯州和密西西比州，造成 ...

d) Nevertheless 6. When they are powerful, tornadoes often destroy buildings and houses. _______ they injure and kill people. a) Still b) However c) Conversely d) Moreover 7. _______ Artificial ...

Lightning is a bright flash of electricity produced by a thunderstorm. Lightning kills and injures between 75 and 100 people every year - more than hurricanes or tornadoes. The highest death toll from ...