Question

14．很多珍稀动物已经灭绝的原因是它们无法适应新的环境，因此我们必须更加注重保持生态平衡． （so）The reason why many rare animals became extinct was that they were not able to adapt （themselves） to the new environment，so we must pay more attention to keeping the balance of nature．．

Answer 1

分析 The reason why many rare animals became extinct was that they were not able to adapt （themselves） to the new environment，so we must pay more attention to keeping the balance of nature．

解答 The reason why many rare animals became extinct was that they were not able to adapt （themselves） to the new environment，so we must pay more attention to keeping the balance of nature．
本句的主句部分是分析的动物已经灭绝的原因，所以为一般过去时；而从句部分则为现在的对策，应用一般现在时．
本句为一复杂的主从复合句，其中主句的主语后面应用一个why引导的定语从句来修饰，后面的原因部分用that引导的表语从句；从句为so引导的结果状语从句．become extinct灭绝；adapt（oneself）to使（自己）适应；pay attention to注意；the balance of nature自然平衡、生态平衡．

点评 本句句式较复杂，学生有的容易用混句型，要逐步分清不同的句式以及在句子中的相应成分，分清主从句．如：Whether he will come to the meeting is up to his boss．