Close the door so that it is warm in the room .
8 . Tie the tree to the top of the stick to keep it straight . 把树和木棍的顶端捆好，以保持树能直立。
［释疑］ ( 1 ) tie…to…“把……捆在……”。例如：
They tied the bad man to the big tree .
Tie his hands to the back of the chair .
to keep it straight 是动词不定工，在句中作状语，表示捆树的目的。straight 是宾语 it 意义上的补充和延伸，所以叫做宾语补足语。又如：
We always keep our classroom clean .
Don\'t touch the machine . You must keep yourselves safe .
( 3 ) 在句中常用来作宾语补足语的还有动词不定式、分词、名词等。例如：
We all call him Lao Wang . 我们都叫他老王。
Who helped you to wash these clothes ?
I saw him going into the office when I came back last night .
9 . Water it well , as often as possible . 尽可能经常地给树浇好水。
［释疑］ ( 1 ) water 可用作动词，意为“给……浇水”。
英语中有些表示物质的名词也可用作动词，试比较下列句中 fish 及 rain 的词性。
He likes to fish on Sunday . But he doesn\'t like eating fish very much .
We had much rain last month , but it hasn\'t rained these days .
( 2 ) 类似 as often as possible 的说法还有：
as soon as possible 尽可能的快 ( 指时间 ) , as fast as possible 尽可能的快 ( 指速度 ) ,as more as possible 尽可能的多, as early as possible 尽可能的早
10 . Why was the Great Green Wall built ? 为什么要营造绿色长城 ?
［释疑］ ( 1 ) The Great Green Wall 指的是三北防护林，即：西北、东北和华北。
整个防护林横贯十三省、市、自治区。
( 2 ) 该句为一般过去时被动语态。
11 . In 1850 , about a third was covered by forests . 1850年，大约三分这一 ( 的美国国土 ) 被森林覆盖。A third 即为 one third 或 1/3。
［释疑］英语中分数的文字表达，分子用基数词，分母用序数词，先读分子，后读分母。当分子大于1时，分母用相应的复数。例如：2 / 3 读作 two thirds . 5 / 7 读作 five sevenths .
12 . A lot of good land has gone with them , leaving only sand . 大片的肥沃土壤随着森林的消失而流失，只留下一片荒沙。
［释疑］ ( 1 ) leaving only sand 在句中作状语，表示土壤流失后的景象。
( 2 ) leave 常用的两个意思为“离开”及“留下”。请比较下面两个句子：
The mother left the baby and hurried to work .
Don\'t leave your baby along in the room .
13 . Today , too many trees are still being cut down it the USA . 如今，在美国，大量的树木仍遭砍伐。
［释疑］句中的 are being cut down 是现在进行时的被动语态。
14 . China does not want to copy the USA\'s example . 中国不愿意步美国的后尘。
［释疑］copy 在此意为“照抄”，“照搬”。例如：
Copy a drawing . 临摹图画。
He is copying the sentences on the blackboard .
15 . The Great Green Wall will stop the wind from blowing the earth away .
［释疑］stop…from doing sth . “阻止……以免……”，“防止……做某事”。
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