在考研英语的完形填空题中，答案的选择往往需要考生综合运用词汇、语法和上下文逻辑推理能力。以下是一个原创的解题示例：
题目：In the past, the family was the basic unit of society. Now, this is no longer true. In many countries, the nuclear family—parents and children—is becoming less common. People are living longer, and many old people prefer to live alone or with friends rather than with their children. They want to be independent and free to do what they want. They don't want to be a burden to their children.
空格处需要填入一个合适的词，使得句子意思通顺。
解题步骤：
1. 分析上下文，理解句子含义：许多老年人选择独居或与朋友同住，而不是与子女一起，因为他们希望保持独立和自由。
2. 确定所需词汇的词性：根据句子结构，空格处应填入一个形容词。
3. 根据语境选择合适的形容词：从上下文可知，空格处应填入表示“负担”的形容词。
答案：a burden
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