To change the light source is costly because you have to change the -考呗网题库移动版

单选题
To change the light source is costly because you have to change the whole fixture．

参考答案G

解析:
To change the light sourceiscostly because you have to change thewhole fixture．
译文
改变光源的成本高昂，因为要替换整套灯具。
定位
由题干关键词change the whole fixture定位到原文画线处。

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