人教版高一英语下册第四单元知识点

1、以下是给你推荐的高一英语下册第四单元知识点，希望对你有帮 助! 英语第四单元知识点 1. In the 18th century, Benjamin Franklin cinducted a number of experiments in which he showed what electricity is. 在 18 世纪，本杰明富兰克林进行了许屡次关于电的实验。问 .in which he showed what electrivity is. in + which 引导定语从 句，修饰先行词 experiments。这里 which 不能由 that 替换。(2).what elec

2、tricity is 宾语从句，做 show 的宾语。(3)A number of. 许多“，大量，接可数名词复数，谓语要用复数形式;the number of.的数量谓语动词应该用单数。例如： A nu mber of peasa nts are work ing in the fields with the sun burning in the shy. 许多农民顶着烈日在地里耕作。2. Having realized that I could use a kite to aftract lightning. I decided to do an experiment. 当我意思到能用风筝

3、来接收闪电后，我决定做个 实验。问Having realized that .在句子充当什 么成分?答Having realized that . 现在分词短语做时间状语。(=when I had realized that I could use a kite to attract lightning, .)3. Most kites are made of paper, but a kite made of silk will last longer in weather with rain and strong winds. 大多数风筝是由纸做的，但用丝绸制的风筝在雨和大风的天气中持续的

4、时间会长一些。问 made of silk 在句中作何成分 ?be made of 与 be made from 有 何区别?答 made of silk 过去粉刺短语所定语，修饰 a kite, he made of. 由构成(看得出原材料);be made from由构成(看不出原材料)。4. The pieces should be just long enough to reach the comers of the han dkerchief那木头片的长度应该到达手帕的四个角。问enough在句中如何用？reach是什么意思？答(1)enough to ." 足够的，en

5、ough修饰形容词时应放在形容词之后。例如：kind enough足够善良的;careful enough足够仔细的。(2)reach v. & n. 到达 ;够得着。例如： out of reach 够不着。5. Add a tail to the frame and tie a long string to the cross so you can control the kite. 在架子上加一个把柄，在十字架上栓一根长细绳以便你 能够控制那风筝。问add.to是什么意思？答add.to把加到 。例如： Please add an article to the sentence,

6、 then it is correct now . 请在这个句子中加上一个定冠词，然后它就对了。6. THis ribbon, which must not get wet, will protect you from the electricity 这根丝带一定不能变湿，它是用来保护你不被触电的。问which must not get wet 作何成分，protectfrom 是什么意思？答(1).which must not get wet ，非限制性定语从句做定语，修饰This ribbon.(2)protect . from. 保护免受, 相当于 prevent .from .;sto

7、p .from.;keep .from。例如：We should prevent our environment from being polluted. 我们 应该保护我们的环境免受污染。7. Around the world, animals are used to test produce such as shampoo, skin creams and new cancer drugs在全世界，动物们被用来测 试如洗发水，皮肤霜以及新的治癌药等产品。问be used to do ., be used to doing .禾口 used to do 有何区 别？答be used to d

8、o .被用来做什么 be used to doing .习惯于做used to do .过去常常做8. They also believe that it is possible touse much fewer an imals他们还相信用更少的动物测试是可能的。问it is possible to do .做是可能的;It is + adj. +to do . it 是形 式主语，真正的主语是动词不定式短语 to do.例如： It is difficult to learn two foreigh languages. 学会两门外语是困难的。It is impossible to wal

9、k on the moon. 在月球上行走是不可能的。 that he is lying.3、 意识到他一个 人干不了这件事，他向我求助。 that he couldn 'dto it himself, he asked me for help.4、 那位老师对全班的学生进行了数学测试。The teacher the whole class maths.、5 请你帮我选出一本杂志好吗 ？Will you a magazine for me？、6 我们可以在大厅拍照吗 ? take pictures in thehall?7、 请在咖啡中加点糖。Please some sugar the

10、 coffee、.8 妈妈开始做家务。Mother is her housework.9、 什么也阻止不了我们到这里来。Nothing will us here.10、 他没有勇气违背他父亲的意愿。He has no couragehis father'、s穿上11这件外套。它可以御寒。Put on this coat. It will you the cold.12、 这些酒瓶是用玻璃制造的。These wine bottles glass.1、3 这种酒是用葡萄酿造的。This kind of wine grapes.1、4 注意在实验开始之前把一切都准备好。 that every

11、thing is prepared before the experiment begins.15、 每个队都有两次得分，比赛不分胜负。Each team scored twice and the game .16、 为什么学生在闻从瓶子里冒出来的气味时要小心 ?Why should students from bottle?17、 如果你眼睛里进了东西，该怎么办 ?What whensomething gets into your eyes?18、 它实在太昂贵了。It is expensive.19、 它既快又干净，而且不产生噪音，就像飞机一样。It 'fasst and clean and it does not make any noise,