由于在历史上曾和多种民族语言接触，英语的词汇从一元变为多元，语法从“多屈折”变为“少屈折”，语音也发生了规律性的变化。精品小编准备了高一北师版必修一unit1知识点，希望你喜欢。
1. distance n.距离
► 归纳拓展
at/from a distance of在/从……远的地方
in the distance在远处
keep a distance away(from)
(与某人或某物)保持一定距离;(对某人或某物)冷淡，疏远
[英文典例]
① A shark can smell blood at a distance of half a kilometer.
鲨鱼能在半公里外闻到血腥味。
②The lion looks dangerous，so I decide to keep a distance away from it.
狮子看起来很危险，所以我决定离它远点儿。
③We saw lights in the distance.
我们看到了远处的点点灯光。
2.reduce vt.&vi.减少，降低，折扣
► 归纳拓展
reduce(from...)to... (从……)减少/降低到
reduce by 减少了，降低了(降低的幅度)
reduce sb./sth.to... 使处于(某种状态)，使成为
[英文典例]
① She reduced her weight by 5 kilograms.
她把体重减轻了五公斤。
②In order to reduce the price of their products，they will take measures to reduce costs at first.
为了降低产品价格，他们将采取措施首先减少成本。
③If you buy more than 5 at a time，we will reduce the price by 10 percent.
如果你一次买五个以上，我们就给你减价10%。
► 名师点津
表示增减升降的起/终点，用from/to，幅度用介词by，能够搭配的动词有rise，raise，grow，fall，increase，decrease，reduce等。
3.go off离开;(爆竹、铃等)响;爆炸;(食物等)变坏;不再喜欢
[英文典例]
A crowd of young men went off with Jenny's portable computer.
一群年轻人抢走了詹妮的手提电脑。
②At midnight she was watching an interesting TV series when the door bell went off.
午夜她正在观看一部有趣的电视连续剧，这时门铃响了。
► 归纳拓展
go against 违背;反对;对……不利
go over 仔细检查;复习;再来一遍
go ahead 开始;继续;进行;前进
go along 继续进行
go into 从事(某职业);调查;研究
go through 仔细检查;经历(困难);浏览
go without 没有……也能忍受过去
③Don't go against your boss;otherwise you will be laid off someday.
不要违背你的上司，否则总有一天你会被解雇的。
4.take up占据，占;开始从事或学习;拿起(武器等)
[英文典例]
①The president called on all the country to take up arms to fight against the enemy.
总统号召全国人民拿起武器抵御外敌。
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