九年级英语第十八单元Planting trees 植树

九年级英语第十八单元Planting trees 植树,标签：初三下册英语教案,初中英语教案,http://www.67xuexi.com

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：

九年级英语第十八单元Planting trees 植树由www.67xuexi.com收集及整理,转载请说明出处www.67xuexi.com

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”。

I have often stopped myself from doing something wrong .

You must stop that big dog from coming into the house .

16 . They must be built all over world . 全世界都必须营造绿色长城。

［释疑］含情态动词的被动语态结构：情态动词 + be + 过去分词，又如：

This work must be finished in a week .

The trees should be watered often .

In south China , rice may be harvested three times a year .

17 . Many thousands of trees must be planted every year . 每年都得裁成千上万株树。

［释疑］ ( 1 ) many thousands of“数千；万千上万”，thousand 在此是名词。又如：hundreds of 好几百, millions of 数百万

( 2 ) hundred , thousand , million 也常常用作数词，此时后面不能加 s。例如：

We\'ve learned about eight hundred English words .

That farmer had over five thousand ducks .

18 . The more , the better . 越多越好。

［释疑］这种句式的结构为：“the + 比较级，the + 比较级”，意为“越……越……”。请看：

Ask all of them to come to the party . The more , the better .

Start your work . The sooner , the better .

The more I think of it , the happier I am .

The harder you work , the greater progress you will make .

19 . This year alone , we\'ve already planted ten thousand trees . 仅仅在今年，我们已经裁了一万棵树。

［释疑］alone 是形容词，在句中意为“仅仅”。又如：

The people live by bread alone .

We all think that he alone can do it .

20 . But we\'re growing a lot more now , thanks to the Green Wall . 然而，幸亏有了绿色长城，我们现在种植了更多的粮食作物。

［释疑］thanks to…构成副词短语，意为“幸亏”，“由于”例如：

Thanks to their help , we won the match .

We arrived at the railway station in time , thanks to that bus driver .

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