7．The announcement of Nobel Prize winners every December is a great scientific event．______，not all
scientists are happy about it．（　�。�
A．BesidesB．ThereforeC．HoweverD．Otherwise

分析 每年十二月份宣布諾貝爾獲獎?wù)叨际强茖W(xué)界的一大盛事，然而，不是所有科學(xué)家都會為此高興．

解答 答案：C
題干中The announcement of Nobel Prize winners every December is a great scientific event表達(dá)的是肯定的意思；后一句not all scientists are happy about it表示的是部分否定，說明兩個句子之間構(gòu)成轉(zhuǎn)折關(guān)系；besides此外，表示遞進(jìn)；Therefore因此，表示因果；However然而，表示轉(zhuǎn)折；otherwise否則，表示條件．根據(jù)句意表示轉(zhuǎn)折，故選C．

點(diǎn)評 并列連詞用來連接并列句．常用的并列連詞有：表并列關(guān)系的and，neither…nor．，either…or…，as well as，not only…but also…；表轉(zhuǎn)折關(guān)系的but，yet，however，still，while；表選擇關(guān)系的either…or…，neither…nor…，or，otherwise；表因果關(guān)系的for，therefore，so，學(xué)習(xí)時(shí)要加以區(qū)分和掌握．

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