7 Read Para. 4 of Text A and analyze the pattern of cause and effect.Identify and label the cause(s) and effect(s).Although totally unprepared, the Crooks put aside their original plan. Out of their heartfelt dedication to the cause of the Chinese revolution, they went to the Central Foreign Affairs School, the predecessor of Beijing Foreign Studies University, to report for duty a turning point in the course of their life. For more than half a century, they worked tirelessly and conscientiously for China's foreign language education. When people asked them, "Why did you choose to work in China?", they responded, "The main reason, of course, is our political commitment."

本题考查因果关系分析能力，需要从段落中识别出原因（cause）和结果（effect）。解题核心在于：

1. 理解段落逻辑：明确事件发生的先后顺序，判断哪些是引发结果的因素，哪些是结果本身。
2. 锁定关键词：注意描述动机、决策或行为的词汇（如“dedication”“political commitment”），以及描述具体行动或长期影响的表述（如“report for duty”“worked tirelessly”）。
3. 因果对应关系：确保原因与结果之间存在直接的逻辑联系，避免混淆并列或补充信息。

步骤1：通读段落，定位因果关系

段落主要讲述Crooks夫妇因对中国革命的奉献和政治信念，做出了人生重大决定并长期投身教育事业。需重点关注以下关键句：

• 原因：heartfelt dedication to the cause of the Chinese revolution（内在动机）和political commitment（核心信念）。
• 结果：went to the Central Foreign Affairs School... report for duty（具体行动）和worked tirelessly for over half a century（长期影响）。

步骤2：排除干扰信息

注意“totally unprepared”是背景描述，与因果关系无关；“a turning point”是结果的补充说明，需整合到效果中。

步骤3：验证逻辑连贯性

原因（奉献与信念）直接导致了他们的决定（报到）和长期行为（工作），符合因果关系的直接性。