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人教版高一英语下册第四单元知识点

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  由于高中阶段要学习的英语知识点比较多,所以从高一开始我们就要注重英语每个单元的知识点复习和积累。以下是小编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多次关于电的实验。

  [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 electricity 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 number of peasants are working inthe 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 handkerchief.那木头片的长度应该达到手帕的四个角。

  [问]enough在句中如何用?reach是什么意思?

  [答](1)enough to ..." 足够……的”, enough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. 达到;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, 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, protect...from...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 ...;stop ...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 ... 和used to do 有何区别?

  [答]be used to do ... 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 to use much fewer animals.

  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 walk on the moon. 在月球上行走是不可能的。

  英语第四单元练习题

  1、 带把伞可防晒。

  Taking an umbrella will ________ _______ ________ ______ -______.

  2、 毫无疑问,他在说谎。

  ______ _______ ______ _______ 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’t do 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 the hall?

  7、 请在咖啡中加点糖。

  Please ______ some sugar ____ the 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 courage ______ ______ _______ his father’s will.

  11、 穿上这件外套。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.

  13、 这种酒是用葡萄酿造的。

  This kind of wine __________ grapes.

  14、 注意在实验开始之前把一切都准备好。

  ________ _______ that everything 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 ______ _____ ______ ______ when something 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’s fast and clean and it does not make any noise, _____ ______ ____.

  20、 那对经济(发展)有好处。

  It ______ ________ ________ the economy.

  21、 你使用的几乎每一种药都曾在动物身上试验过。

  Almost every medicine you use ______ ______ ________ _______ animals.

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