课文详注 Further notes on the text
1．is surrounded by，由……环绕着。
2．hundreds of people，数以百计的（游）人。
3．Visitors have been asked to keep the woods clean and tidy．游客已被告知要保持树林的整洁。
句中 have been asked是被动语态的完成时结构。（详见本课语法部分。）to keep the woods clean and tidy是动词不定式短语，作主语visitors的补足语。clean and tidy 是宾语 the woods 的宾语补足语。
4．go for a walk，去散步。
5．What I saw made me very sad．我所见到的一切使我非常难过。
句中的主语What I saw 是 what 引导的名词性从句。
语法 Grammar in use
（1）现在完成时形式： has/have + been + 过去分词：
The basket has already been emptied.
They have already been invited.
（2）一般将来时形式： will/shall +be +过去分词：
The floor will be swept soon.
The knives will be sharpened soon.
词汇学习 Word study
He placed the record back to the shelf.
Their request placed me in a difficult position.
The company has placed him with a branch office in Tokyo.
There is no better way to place the homeless children.
Trespassers will be prosecuted.
They prosecuted him for shoplifting.
We are going to prosecute the investigation further.
The beautiful white house is surrounded by green trees.
That old professor loved to surround himself with young people.
When I went into the room, I saw Tim sitting on the floor surrounded by boxes.
练习答案 Key to written exercises
1 The writer lives in a very old town which is surrounded by beautiful woods.
2 Because it is a famous beauty spot.
3 Visitors have been asked to keep the woods clean and tidy.
4 Litter baskets have been placed under the trees.