句型51：be+num. +metres / kilometres / years...+long / wide / deep / high / old...

　　The Great Green Wall is 7，000 kilometres long.

　　绿色长城长7000公里。

　　The river is about 2 metres deep.

　　这条河大约有2米深

　　The boy is about 12 years old .

　　这个男孩约12岁。

　　句型52：keep ... from doing

　　The heavy rain kept us from starting out.

　　大雨阻止了我们出发。

　　句型53：with one’s help...

　　With your help，I've come to Nanjing to study further. 在你的帮助下，我来南京深造。

　　句型54：I don’t think ...

　　I don't think any of them is important.

　　我不认为他们中任何一个是重要的。

　　句型55：What’s the population of ...?

　　What's the population of Nanjing ?

　　南京人口有多少？

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