[解析]
(1)推理判断题。根据第一段Over the last two days in December last year,nearly 30 tornadoes caused great damage across six states — from Arkansas in the south to Illinois in the midwest.More than 100 tornado warnings were issued — the most ever for a day.The tornado in Kentucky caused at least 50 people's deaths,which was described as the worst in this state's history.(在去年12月的最后两天里,从南部的阿肯色州到中西部的伊利诺伊州,近30次龙卷风在六个州造成了巨大的破坏,发布了100多个龙卷风警告,这是有史以来最多的一天。肯塔基州的龙卷风造成至少50人死亡,这被描述为该州历史上最严重的一次。)可知,通过第一段的数字我们知道美国遭受了严重的自然灾害。故选D项。
(2)段落大意题。根据第三段The west coast is at risk of wildfires,earthquakes,and even volcanic eruptions.The southern part of the country is frequently hit by tornadoes,and the east coast faces the threat of serious hurricanes every year.Midwestern areas near rivers are often flooded by huge floods,and these are the worst floods in American history.(西海岸面临野火、地震甚至火山爆发的风险。该国南部地区经常受到龙卷风的袭击,东海岸每年都面临严重飓风的威胁。靠近河流的中西部地区经常被巨大的洪水淹没,这些都是美国历史上最严重的洪水。)可知,第三段主要介绍了美国不同地区的自然灾害。故选A项。
(3)观点态度题。根据最后一段American weather continues to become more changeable.In 2018,there were 14 weather events that caused over $ 1 billion in damage.And in many parts of the country,these weather events could become even more destructive(毁灭性的) because of global warming. (美国的天气继续变得更加多变。2018年,有14个天气事件,造成超过10亿美元的损失。在该国的许多地方,由于全球变暖,这些天气事件可能会变得更具毁灭性。)可知,美国的天气多变,可能会变得更具毁灭性。由此推知,美国未来的天气令人担忧。故选D。