人教版高一英語下冊第四單元知識點
人教版高一英語下冊第四單元知識點
由于高中階段要學(xué)習(xí)的英語知識點比較多，所以從高一開始我們就要注重英語每個單元的知識點復(fù)習(xí)和積累。以下是小編給你推薦的高一英語下冊第四單元知識點，希望對你有幫助!
英語第四單元知識點
1. In the 18th century, Benjamin Franklin cinducted a number of experiments in which he showed what electricity is.在18世紀，本杰明富蘭克林進行了許多次關(guān)于電的實驗。
[問]...in which he showed what electrivity is. in + which 引導(dǎo)定語從句，修飾先行詞experiments。 這里which不能由that替換。
(2)...what electricity is 賓語從句，做show的賓語。
(3)A number of...“許多，大量”，接可數(shù)名詞復(fù)數(shù)，謂語要用復(fù)數(shù)形式;the number of...“……的數(shù)量”謂語動詞應(yīng)該用單數(shù)。
例如：A number of peasants are working inthe fields with the sun burning in the shy. 許多農(nóng)民頂著烈日在地里耕作。
2. Having realized that I could use a kite to aftract lightning. I decided to do an experiment. 當我意思到能用風(fēng)箏來接收閃電后，我決定做個實驗。
[問]Having realized that ... 在句子充當什么成分?
[答]Having realized that ... 現(xiàn)在分詞短語做時間狀語。(=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. 大多數(shù)風(fēng)箏是由紙做的，但用絲綢制的風(fēng)箏在雨和大風(fēng)的天氣中持續(xù)的時間會長一些。
[問]made of silk 在句中作何成分?be made of 與be made from 有何區(qū)別?
[答] made of silk 過去粉刺短語所定語，修飾a kite, he made of...由……構(gòu)成(看得出原材料);be made from 由……構(gòu)成(看不出原材料)。
4. The pieces should be just long enough to reach the comers of the handkerchief.那木頭片的長度應(yīng)該達到手帕的四個角。
[問]enough在句中如何用?reach是什么意思?
[答](1)enough to ..." 足夠……的”， enough修飾形容詞時應(yīng)放在形容詞之后。例如：kind enough 足夠善良的;careful enough足夠仔細的。
(2)reach v. & n. 達到;夠得著。例如：out of reach夠不著。
5. Add a tail to the frame and tie a long string to the cross so you can control the kite.在架子上加一個把柄，在十字架上栓一根長細繩以便你能夠控制那風(fēng)箏。
[問]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 .請在這個句子中加上一個定冠詞，然后它就對了。
6. THis ribbon, which must not get wet, will protect you from the electricity.這根絲帶一定不能變濕，它是用來保護你不被觸電的。
[問]which must not get wet 作何成分， protect...from...是什么意思?
[答](1)...which must not get wet ，非限制性定語從句做定語，修飾This ribbon.
(2)protect ... from... “保護……免受……”，相當于prevent ... from ...;stop ...from...;keep ...from。
例如：We should prevent our environment from being polluted. 我們應(yīng)該保護我們的環(huán)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，動物們被用來測試如洗發(fā)水，皮膚霜以及新的治癌藥等產(chǎn)品。
[問]be used to do ..., be used to doing ... 和used to do 有何區(qū)別?
[答]be used to do ... 被用來做什么......
be used to doing ... 習(xí)慣于做……
used to do ...過去常常做……
8. They also believe that it is possible to use much fewer animals.
他們還相信用更少的動物測試是可能的。
[問]it is possible to do ...做……是可能的;
It is + adj. +to do ... it 是形式主語，真正的主語是動詞不定式短語to do...
例如：It is difficult to learn two foreigh languages. 學(xué)會兩門外語是困難的。
It is impossible to walk on the moon. 在月球上行走是不可能的。
英語第四單元練習(xí)題
1、 帶把傘可防曬。
Taking an umbrella will ________ _______ ________ ______ -______.
2、 毫無疑問，他在說謊。
______ _______ ______ _______ that he is lying.
3、 意識到他一個人干不了這件事，他向我求助。
_______ ________ that he couldn’t do it himself, he asked me for help.
4、 那位老師對全班的學(xué)生進行了數(shù)學(xué)測試。
The teacher ________ the whole class ______ maths.
5、 請你幫我選出一本雜志好嗎?
Will you ________ _______ a magazine for me?
6、 我們可以在大廳拍照嗎?
______ ______ ________ ______ take pictures in the hall?
7、 請在咖啡中加點糖。
Please ______ some sugar ____ the coffee.
8、 媽媽開始做家務(wù)。
Mother is _________ ______ ______ her housework.
9、 什么也阻止不了我們到這里來。
Nothing will __________ us _______ ________ here.
10、 他沒有勇氣違背他父親的意愿。
He has no courage ______ ______ _______ his father’s will.
11、 穿上這件外套。它可以御寒。
Put on this coat. It will _______ you ________ the cold.
12、 這些酒瓶是用玻璃制造的。
These wine bottles __________ glass.
13、 這種酒是用葡萄釀造的。
This kind of wine __________ grapes.
14、 注意在實驗開始之前把一切都準備好。
________ _______ that everything is prepared before the experiment begins.
15、 每個隊都有兩次得分，比賽不分勝負。
Each team scored twice and the game_______ ______ ______ _______.
16、 為什么學(xué)生在聞從瓶子里冒出來的氣味時要小心?
Why should students _______ _______ ________ from bottle?
17、 如果你眼睛里進了東西，該怎么辦?
What ______ _____ ______ ______ when something gets into your eyes?
18、 它實在太昂貴了。
It is ______ ______ expensive.
19、 它既快又干凈，而且不產(chǎn)生噪音，就像飛機一樣。
It’s fast and clean and it does not make any noise, _____ ______ ____.
20、 那對經(jīng)濟(發(fā)展)有好處。
It ______ ________ ________ the economy.
21、 你使用的幾乎每一種藥都曾在動物身上試驗過。
Almost every medicine you use ______ ______ ________ _______ animals.
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