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选修7《Grammar》精品PPT课件优质课下载
This picture is about global warming. It is a serious problem, because it’s important for us to protect our earth. Therefore, we find it necessary for us human beings to take some measures to slow down global warming.
reference
formal subject
formal object
强调
emphatic sentences
Tips
You want to get the case back?
No way unless you can accomplish some tasks！ First, show me how much you know about global warming.
1. It is mainly ________ that/who has caused global warming.
the nature
the human race
B
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