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---The air pollution is terrible.

---It will be worse _______ we take action to protect the environment.

A. if B. unless

C. until D. When

B

【解析】

試題分析:句意為:---空氣污染太可怕了。---如果我們不采取措施保護(hù)環(huán)境,將會更加糟糕。if:如果, unless:除非、如果不,until :直到……才……,When:當(dāng)……時候。根據(jù)語境可知應(yīng)選B。

考點(diǎn):考查連詞的用法辨析。

考點(diǎn)分析: 考點(diǎn)1:連詞 連詞是一種連接詞與詞,短語與短語以及句與句的虛詞, 它不能獨(dú)立擔(dān)任句子成分而只起連接作用。連詞主要可分為兩類:并列連詞和從屬連詞。
連詞用法
一、并列連詞用來連接平行的詞、詞組和分句。并列連詞連接的雙方是對等的。
常有的并列連詞有and, both…and(兩者都),  neither…nor(既不……也不……), not only…but also(不但…而且), as well as等。但如果連接的兩部分意義不趨向一致,意義有轉(zhuǎn)折的并列連詞有:but(但是), however(然而), while (而),only (只不過)。還有表示選擇關(guān)系的并列連詞,
如:or, either…or(或者…或者…), 再有的是連接雙方,互為因果,或表示前因后果的連詞有:for(因?yàn)椋? so(所以), therefore (因此)等。
例句: She plays not only the piano, but (also) the guitar.
二、從屬連詞,在初中范圍內(nèi)常常考查引導(dǎo)狀語從句、賓語從句的從屬連詞。其中有時間狀語從句,
常用的連接詞有:when, while, as, since, before, after, once, as soon as, until, till連
接條件狀語的連詞有:if, unless, as long as等,而原因狀語的連接詞有because, since, as, now that (既然)。目的、結(jié)果、方式、比較、地點(diǎn)等狀語從句的連接詞有:so that, so…that, such…that, as…as, than, where… 它們在句子與文章中幾乎無處不見。用來連接賓語從句,如:that, if, whether。
例句如下:
Tom will call me as soon as he gets to Shanghai.
The meeting didn't start until  everyone was there.
I want to know if she is going to see a film.
常見考法
    對于連詞,主要以單項(xiàng)選擇或完形填空的形式從意義和功能(重點(diǎn)是意義)角度考查學(xué)生靈活運(yùn)用連詞的能力。在題中,要分清上下句之間的邏輯關(guān)系是轉(zhuǎn)折還是并列,或是選擇,在從屬連詞中,會給出我們一個語境,讓我們判斷該用哪個連詞。
典型例題1:  Betty didn't go to see the film yesterday ___ she was ill.
               A.  because   B. but   C.  until    D. If
解析:本題通過語境考查從屬連詞的用法。只要明白語境,分清選項(xiàng)中四個連詞的用法,就能選出正確答案!八×恕笔恰癇etty昨天沒有去看電影”的原因,顯然,應(yīng)用表示因果關(guān)系的 because 。
答案:A
典型例題2:Nancy looked around,          didn't see anybody.
          A  and      B  so     C  but      D because
解析:這是2007年南通的中考題,本題考查并列連詞的用法。題干的意思是“向     四周看,但是她沒有看到任何人”。四個選項(xiàng)中but是“但是”的意思。
答案:  C
誤區(qū)提醒
1、neither…nor(既不……也不……), not only…but also(不但…而且), either…or(或者…或者…)連接主語,謂語動詞要采用就近原則。例如:Neither you nor he is to blame.(注意:謂語動詞采用就近原則,與nor后的詞保持一致。)
2、because和 so,but 和though不能同時用。在漢語中它們是一組關(guān)聯(lián)詞,經(jīng)常在一起出現(xiàn),但在英語中,只能用其中一個。例如:Because he got up late,so he didn't catch the bus.這句話就錯了,我們要么去掉Because,要么去掉so。

試題屬性
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