2020高考英語(yǔ)備考單元知識(shí)搜索與探究歸納Unit20 Scientists at work
a lot of
a large quantity of(謂語(yǔ)動(dòng)詞的單復(fù)數(shù)取決于of后的名詞）
large quantities of(謂語(yǔ)動(dòng)詞用復(fù)數(shù))
a large quantity of coal has been burnt.
已經(jīng)燒了大量的煤了。
a large quantity of students have finished reading the book.
很多學(xué)生已經(jīng)看完了這本書(shū)。
large quantities of water have been polluted.
大量的水已經(jīng)被污染了。
plenty of
i have plenty of time.
我有很多時(shí)間。
要點(diǎn)2 protect...from...
【例題】(上海春，55)people first began to wear hats to_______ themselves from the climate.
a. defend b. protect c. prevent d. hide
解析:本句意為：“人們一開(kāi)始戴帽子是為了保護(hù)自己不受氣候的影響。”protect...from意為“保護(hù)……不受……影響”；defend意為“保衛(wèi)，捍衛(wèi)”；prevent意為“防止，預(yù)防”；hide意為“隱藏，隱瞞”。
答案:b
歸納與遷移
protect...from(against)...使（保護(hù)）……不受……
（1）+名詞
we should wear more clothes to protect ourselves from the cold weather.
我們應(yīng)該多穿些衣服來(lái)御寒。
（2）+doing sth.
i wear a hat in summer to protect myself from being burnt.
我夏天戴帽子是為了防止自己被曬傷。
特別提醒：
protect接較大的事情，如：天災(zāi)、戰(zhàn)爭(zhēng)等，一般用against;如果接比較小的事情則通常用from。
必背句型
要點(diǎn)1 there is no doubt that... 毫無(wú)疑問(wèn)……
【例題】（廣東，34）some researchers believe that there is no doubt _____a cure for aids will be found.
a. which b. what
c. that d. whether
解析:本句意為：“一些研究員認(rèn)為毫無(wú)疑問(wèn)以后艾滋病肯定能治愈。”there is no doubt that...表示“毫無(wú)疑問(wèn)”。
答案:c
歸納與遷移
(1)there is no doubt that...表示“毫無(wú)疑問(wèn)”，doubt后跟否定句，用that引導(dǎo)。
there is no doubt that he is a good student.
毫無(wú)疑問(wèn)他是一個(gè)好學(xué)生。
（2）doubt后跟肯定句，用if/whether引導(dǎo)。
i doubt if/whether he will come.
我懷疑他會(huì)不會(huì)來(lái)。
（3）有關(guān)doubt的詞組：
no doubt“肯定地，想必”；without doubt “毫無(wú)疑問(wèn)，一定地”。
no doubt i have won the game.
毫無(wú)疑問(wèn)我贏了那場(chǎng)比賽。
he will recovery soon without doubt.
他一定會(huì)很快恢復(fù)的。
要點(diǎn)2 so...that... 引導(dǎo)狀語(yǔ)從句
【例題】 liu xiang did______ well at athens olympic games______ all china are proud of him.
a. so; that b. as; as
c. not only; but also d. both; and