【题目】阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写 1个适当的单词，在给出提示词的空白处用括号内所给词的正确形式填空。
This aging of the population is driven by two factors. The first is declining birth rates, which means old generations are large 【1】（compare） to younger generations, and so, on average, the population becomes older than before. This is 【2】（especial） true in the US. The second reason is 【3】 people are living longer. A child born in the US today has a very realistic chance of living beyond 100 and needs to plan accordingly.
【答案】
【1】compared
【2】especially
【3】that
【解析】
这是一篇说明文。文章介绍了人口老龄化是由两个原因造成的。
【1】考查非谓语动词。句意：首先是出生率的下降，这意味着老一代比年轻一代人口多，因此，平均而言，人口比以前老龄化。宾语从句的谓语的are large，且compare与逻辑主语是old generations之间是被动词关系，因此此处要用过去分词形式在句子中做状语。故填compared。
【2】考查副词。句意：在美国尤其如此。此处要用副词修饰形容词true。故填especially。
【3】考查表语从句的引导词。句意：第二个原因是人们的寿命变长了。根据系动词is可知此处是一个表语从句，从句people are living longer结构完整，不缺成分，因此要用that引导表语从句。故填that。
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