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We must do something to protect the earth, ____we will lose our home.
A.andB.orC.soD.but
B

试题分析:and和,并且;or或者,是否;so因此;but但是。句意:我们必须做点什么来保护地球,否则我们会失去我们的家园。结合语境可知选B。
点评:连词在句子中主要起联系上下文的作用,他们之间的区别就是表示逻辑关系的不同,所以在解题时先要理解上下文含义,然后根据上下文逻辑关系选择合适的连词。连词的用法都比较多,语义之间还有交叉,熟记其基本应用规则,了解其区别,注意固定搭配对象,是做好此类题型的关键。
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