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高一英语第十七单元Nature (自然界与动物保护)－教学教案,
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 ani
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