SENTENCE EXPLANATIONS1. The national average is only about 12.7 percent, so it is not surprising that Florida is known as the oldest place in the USA. (P18)【分析】这是一个主从复合句。The national average is only about 12.7 percent 是主句；从属连词 so 引导的是结果状语从句，其中 it 是形式主语，真正的主语是 that 引导的主语从句，介词短语 in the USA 作地点状语。【句意】 全国平均比例仅为 12.7%，因此佛罗里达州被认为是美国最老的地方也就不足为奇了。2. Most agree, however, that they like the climate in Florida, which, apart from a few hurricanes, is warmer than in other places. (P18)【分析】 这是一个主从复合句。主句是 Most agree ...。that 引导一个宾语从句；关系代词 which 引导的是非限制性定语从句，修饰先行词 climate，其中 than 又引导一个比较状语从句，than 后省略了 the climate。【句意】 不过，大多数人同意，他们喜欢佛罗里达州的气候，这里除了偶尔有飓风，气候比其它地方暖和。3. For example, ambulances respond faster now, and many houses have bathrooms designed for older owners, with things like easy-to-use bathtubs that reduce the risk of slips and falls. (P18-19)【分析】 这是一个并列复合句。and 连接的后一分句是复合句，其中 that reduce the risk of slips and falls 是定语从句，修饰 bathtubs；V-ed 短语 designed for older owners 作 bathrooms 的后置定语；介词短语 with things like easy-to-use bathtubs 作定语，相当于定语从句（which have things like ...）。【句意】 例如，现在救护车的反应速度更快了，许多房子有专为老年业主设计的浴室，配有如易用型浴盆等设施以减少滑倒和摔伤的风险。
