1．We should do everything to protect the earth，     we'll lose our home．（　　）
A．orB．soC．and

分析 我們應(yīng)該盡一切所能保護地球，否則我們將失去我們的家園．

解答 答案：A；or，否則；so于是；and，和；根據(jù)句中信息We should do everything to protect the earth，we'll lose our home．可知后句是上句相反的假設(shè)，意為"否則，要不然"；用or引導(dǎo)；故選A．

點評 連詞的用法都比較多，語義之間還有交叉，熟記其基本應(yīng)用規(guī)則，了解其區(qū)別，注意固定搭配對象，是做好此類題型的關(guān)鍵．

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