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另外也需要注意零冠词的情况。零冠词用法归纳：独一职位在某地，用作表/补/同位语；独立主格作状语，用by短语表方式；man字一词指人类，对比含义两名词；系词turn+名单数，街/路/期刊与杂志；具体意义变抽象，as/though之倒装句；人名/地名/国一词，抽象/物质不特指；桥名/单岛/单山峰，一专加一普专用词；月份/星期/节假日，学科/语言/称呼语；颜色/病名/五感觉，棋类/球类/三餐词；复数名词系泛指，固定词组惯用语；以上情况请记住，其前均用零冠词。 背单词的好方法 随时随地背单词
only if: “只要……”，相当于as long as，位于句首时，其后用倒装语序。 Navajo soldiers，if captured by the enemy，could understand the code.More than 3,600 Navajos served in World War Ⅱ， but only 420 were Code Talkers with the US Marines.They coded and decoded battlefield messages better and faster than any machine.They could encode，transmit，and decode a three-line English message in 20 seconds.Machines of that time required 30 minutes to perform the same job. Even after the war the code remained top secret.When they were asked about their role，Code Talkers just said，“I was a radioman.” War movies and histories came out without mentioning them.The code was never used again and was finally declassified in 1968.Only then did the secret come out. ( )1.What do we know about the Navajo language?【C】 A.It has complex spoken and written forms. B.It was created during the Second World War. 易错点4序数词、比较级、最高级前误用定冠词 序数词前用不定冠词而不用定冠词the的情况： 泛指某一类人或物中的任何一个。 A teacher shouldn't talk like that.教师不应当那样讲话。 用于序数词前表示＂又一＂＂再一＂。用于形容词最高级前意为＂很，非常＂。 We'll have to do it a second time.我们得再做一次。 He is a most wise man.他是一个十分明智的人。 “Croeso I Gymru！” If you don’t know what this means，read on to find out more. When you cross over the border from England into Wales，you don’t have to show your passport but you do notice a difference immediately.All the road markings and signs are shown in two languages—English and Welsh(威尔士语).Not all visitors to Britain know that other languages are spoken here.There’s the Gaelic language(盖尔语) in Scotland and a few people speak Cornish(康沃尔语) in the southwest of England，but the most widely spoken language in the UK besides They have leading experts in this field, and that's ________ they've made important progress. A. where B. why C. whether D. who Muir succeeds ________ other designers have failed—her clothes are original, yet stylish. A. that B. what C. which D. where 
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