As a result of the forest , the cold wind reduced its power .
注意①as a result of 是个介词短语，与其意义及用法相同的是“as the result of”，但 as a result of 用得较多些。
②as a result 意为“结果，因此”，在句中作插入语。如：
The workers worked harder than ever . As a result , the output of the iron and steel company went up rapidly .
18 . from across… — 从……的对面
Today you can either fly to Abu Simbel or you can take a boat from across the lake . 今天你既可以乘飞机去阿布辛波古庙，也可以从湖的对岸乘小船过去。
I saw you first from across the street .
He said hello to me from across the room .
19 . make a good effort — 作很大的努力
I will make a good effort to help you .
The wounded soldier made a good effort to stand up .
单元难点疑点思路明晰
1 . The dam , which is the biggest in the world , is 3 , 830 metres long . It is 980 metres wide at the base and 40 metres wide at the top . 这座水坝是世界上最大的一座，长3，830米，底部宽980米，顶部宽40米。
表示计量的句型的常用结构形式：“主 + 谓 + 数词 + 表示单位的名词 + 形容词”用来表示“某物有多长 ( 宽、深、高 ) 等，又如：
The wall is three metres high .
The stick is five inches long .
The hole is seven feet deep .
The river is half a mile wide .
The boy is eight years old .
2 . Can\'t we visit the High Dam ? 我们去看大坝好吗 ?
以否定形式提问的疑问句叫否定疑问句，这种疑问句包括一般疑问句和特殊疑问句的结构。句中的 not 可以和有关的 be , have 以及助动词、情态动词结合，构成～n\'t 形式放在主语之前。
一般否定疑问句往往①表示怀疑、惊讶、责备。②邀请或征求意见等意义，实质上它具有强烈的“肯定”意味。问者希望对方给以肯定的答复。又如：
Can\'t you come over and join us ? 你就不能过来和我们作伴吗 ? ( 表示征求意见 )
Won\'t you sit down . 请坐。 ( 表示邀请 )
Can\'t you ( really ) ride a bicycle ?
你 ( 真的 ) 不会骑自行车吗 ? ( 惊讶，不相信 )
Can\'t you shut the door behind you ? 你难道不能随手关门吗 ? ( 责备，不期望得到回答 )
Don\'t you remember that holiday we had in Beijing ? 难道你不记得我们在北京的度假吗 ? ( 惊讶 )
Won\'t you help me ? 难道你不会帮助我吗 ? ( 表示不相信 )
Mustn\'t we leave now ? 难道我们现在一定不能走吗 ? ( 表示惊讶，不相信 )
Haven\'t you forgotten something ? 难道你们没忘记什么吗 ?
Haven\'t we cleaned the room already ? 难道我们没有把房间打扫干净 ?
3 . As a result of the dam , the water level of the lake was going to rise by 63 metres . 由于兴建水坝，湖面将会提高63米。
by 在此处表示增减程度。如：
He is older by five years than Tom .
The price has been increased by 2 yuan .
Production fell by about one - third .
Line AB is by 4 feet longer than Line CD .
My father missed the train by three minutes .
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