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    6．Old batteries can't be discarded _____ even when they are no longer useful，because they'll pollute the environment．（　　）
    A．casuallyB．partlyC．graduallyD．immediately

    分析 废旧电池即使没有了使用价值也不可随手乱丢，因为它们会污染环境

    解答 答案：A．根据because they'll pollute the environment可知前句表示废旧电池即使没有了使用价值也不可随手乱丢，四个选项的含义分别是A"随意地，漫不经心地"；B"部分地"；C"逐渐地"；D"立刻"，所以答案是A．

    点评 考查副词辨析．casually的例子：
    1．Don't dress casually when you want tobe taken seriously．
    当你要保持严肃的当儿，穿着不能太随便．
    2．He mentioned the problem casually with no advertence to its importance．
    他随便地提到那问题，而没有讲述到它的重要性

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