人教版高一英语下册第四单元知识点
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!
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] 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) 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]...是什么意思?
[答]...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， ...是什么意思?
[答](1)h 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 ...;keep 。
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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