题目内容
8．I wish I knew how toturn on the heating．真希望我知道怎么开暖气．
分析 turn on．
解答 答案：turn on．这里是要表达出开暖气，暖气是电器且有开关的，打开电器类有开关的事物，用turn on，句中是疑问词how+to do结构，表示怎样去做某事，故答案是turn on．
点评 turn on 用于电器类的，技术上的"打开"turn on the TV 对应的关闭用turn off
open用于门窗这一类动作上的"打开"Open the door对应的关闭用close．
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