I have o 《九年级英语第十八单元Planting trees 植树(第4页)》出自：www.89xue.com网
www.89xue.com ften 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 .
21 . Is it straight ? More or less . 树放直了吗 ? 基本上是直的。
［释疑］more or less “或多或少，差不多”。例如：
What he said is more or less true .
22 . 同义词 wear , dress , in , put on , try on 的区别
［释疑］ ( 1 ) wear ( 穿，戴 ) ，表示穿着的状态，它不仅可以表示“穿着”某种
衣服，还可广义地用于穿鞋、穿袜、戴帽、戴手表、戴眼镜等。如：
She was wearing a red dress ( a pair of white gloves , glasses , a gold ring , a new watch ) at the ball that night . 那天晚上在舞会上她穿着红色连衣裙 ( 戴着一副白手套，眼镜，一枚金戒指，一块新手表 ) 。
( 2 ) dress ( 穿，穿着 ) ，既可表示穿着的动作，又可表示穿着的状态，只用于穿衣。当 dress 作及物动词时，后面的宾语只能是人。
Have you finished dressing ?
He dressed and went out .
She was dress in with .
Mother dressed the child .
( 3 ) in ( 穿着，身着 ) ，表示状态。in 是介词。
The PLA men are in green uniform .
The comrade in blue is director of the play .
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