注意：so many和too many的顺序。too much修饰不可数名词。如：Too much of such rain will ruin the crop .
7. year by year年复一年
They liked the cool wet weather there and their number increased year by year .
We should do everything possible to enable the peasants to raise their personal incomes year by year .
注意由“名词 + by + 名词”的短语还有：step by step逐步地，two by two两个两个地，little by little逐步地。
8. south of = to the south of在……以南
The zoo is three miles south of the city . 动物园在城南三英里处。
Hunan Province lies to th 《高一英语第十七单元Nature (自然界与动物保护)(第7页)》出自：www.89xue.com网
www.89xue.com e north of Guangdong .
9. one day总有一天；有一天
该词组可以指过去，也可以指将来。但some day指将来。
One day last summer I made a trip to the country .
You will come to see the importance of English one day (= some day) .
10. in the wild在荒野；在旷野
These animals had to live in the wilds of northwest China .
11. once more = once again再次；重新
The facts showed once more that he was not interested in music .
12. one after another = one after the other = one by one 一个接一个；相继
The students left the theatre one after another after the play .
13. in the past year在过去的一年中
A lot of work has been done in the past year .
注意：类似的还有，in the past few years在过去的几年中，in the last few months在过去的几个月中。出现这样的短语时，句子常用完成时态。而in the past (在过去) 却需要使用过去时。
14. be similar to和……差不多，和……相近
If one thing is very similar to another thing , they look almost the same .
Cameras are similar to the human eye .
15. make a study of对……加以研究
She gave us some advice on how to make a study of teaching methods .
16. set free释放
The girl set the pretty birds free .
二、学海导航
【学法指要】
单元难点疑点思路明晰
1. at present ; at the present time ; for the present
〖明晰〗这三个短语近义，都可表示“目前；现在”。第一个中的 present 是名词，其前不用定冠词；第二个中的 present 是形容词 ( 意为“现在的 ) ；第三个中的 present 是名词，其前要用定冠词。at present 与 at the present time 通常可互换，而 for the present 侧重指“暂时”。如：At present there are not many milu deer in nature parks in China .
We use this tense to show that something is being done at the present time .
For the present we do not need that book , so please go on reading it yourself .
2 . one day ; some day ; the other day
〖明晰〗这三个短语都可表示“某一天”，但用法不同。
( 1 ) one day 可指过去或将来的某一天，some day 只能指将来的某一天，the other day 指过去 ( 不久前 ) 的某一天。如：
At all these centres it is hoped that one day they will have enough animals to set them free and let them live in the wild again .
You\'ll be an engineer some day .
I met him the other day at the bus station .
( 2 ) 这三个短语通常作状语用，但 one day 间或能作主语用。如：
One day on the moon is as long as two weeks on the earth .
( 3 ) one day 不能连写成一个词。而 some day 有时可连写成 someday。如：
Someday we may drive cars that are run by electricity .
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