Clearly and thoughtfully written，the book inspires confidence in students who wish to seek their own answers. 答案

　　Well，now there’s a system where the waste is disposed of using the principles of ecology. 哦，现在有一种装置，能利用生态学原理来处理掉废弃物。

　　11. 这是一个主从复合句。where在句中引导定语从句，修饰先行词a system。where还可以引导定语从句修饰抽象地点名词，如：point，stage，case，situation，condition，position，environment，activity，race，job，scene等。 句型公式：where引导定语从句 (1)He got into a situation where it is hard to decide what is right and wrong. 他陷入一种难以分辨是非的局面。 (2)The H10N8 virus has previously been detected in animals for many years，but this is the first case where it was transmitted to a human being. H10N8病毒先前已被检测出在动物身上存在多年，但这是第一例人感染该病毒的病例。 多维训练 (1)单句语法填空 The book has helped me greatly in my daily communication，especially at work

　　a good impression is a must. (2)同义句改写 ①In countries where many different languages are spoken，English is often used as an official language to help people communicate.(用“介词＋关系代词”改写) In countries

　　many different languages are spoken，English is often used as an official language to help people communicate. where in which 答案 ②He no longer belongs to where he lives.(改为where引导的定语从句)

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