九年级英语第二十单元

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10….as often as possible 尽可能常……
as soon as possible 尽可能地快
as far as possible 尽可能地远些
11．Today, too many trees are still being cut down in the USA.
今天在美国人有大量树木继续被砍伐。
be+being+过去分词是现在进行时的被动语态，表示“正在被……” 如：
The silk is being produced by the factory. 这个工厂正在生产丝绸。
12．The Great Green Wall is 7,000 kilometres long, and between 400 and 1,700 kilometres wide.
这绿色长城长为7，000公里，款再次00指，700公里之间。
表示计量的方法是：数词+metres/kiometres+long/wide/deep/high/tall…
表示重量可用数词+kiograms+heavy 如：
The class room is 4 metres wide. 这个教室有4米宽。
The river is about 10 metes deep. 这条河有10米宽。
13．There are twenty more trees to be planted!
还有20可树要种呢！
to be planted是动词不定式的被动式，作明词trees的定语。动词不定式作定语时，通常放在被修饰名词之后。如：
We have a lot of food to eat. 我们有许多食物可吃。
I have many books to read. 我有许多书要看。

同步测试
一.用所给词的适当形式填空
1.Come to school in ______ old clothes tomorrow. (you)
2.About half of the USA was ____ by forests. (cover)
3.The more, the ___- .(good)
4.People have planted a large number of trees in the _____ part of China. (north)
5.The old farmer is _______ his horse to the tree. (tie)
6.More vegetables should be ______ in the village. (grow)
7.The river is ten meters _____ than that one. (deep)
8.Grandpa _____ flowers every morning. (water)
9.The railway is ____ of kilometers long. (million)
10.Look. How _____ the little girl is dancing! (wonderful)
(1.your 2.covered 3.better 4.northern 5.tying 6.grown 7.deeper 8.waters 9.milliona 10.wonderfully)
二.选择填空
or, away, knock, take, so that, make sure, save, build, copy. push
1.How far ___ is Australia from China?
2.____ that you will be free next Sunday.
3.China does not want _____ the USA’s example.
4.Great Green Walls must ____ all over the world.
5.The Great Green Wall has already ______ a lot of farmland.
6.Trees should _____ good care of.
7.Go to bed early ______ you can get up early tomorrow morning.
8.I _____ a stick into the earth at that time.
9.Work harder _____ you won’t pass the exam.
10.______the earth down hard with your foot several times.
(1.away 2.Make sure 3.to copy 4.be built 5.saved 6.be taken 7.so that 8.was knocking 9.or 10.Push)
三.阅读短文，根据内容选择适当的答案
The Indians breathe thin air. The air goes up for thousands of miles. The higher the air goes up, the thinner it gets. Thin air is hard to breathe.

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九年级英语第二十单元