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 廢舊電池即使沒有了使用價值也不可隨手亂丟，因為它們會污染環(huán)境

解答 答案：A．根據(jù)because they'll pollute the environment可知前句表示廢舊電池即使沒有了使用價值也不可隨手亂丟，四個選項的含義分別是A"隨意地，漫不經心地"；B"部分地"；C"逐漸地"；D"立刻"，所以答案是A．

點評 考查副詞辨析．casually的例子：
1．Don't dress casually when you want tobe taken seriously．
當你要保持嚴肅的當兒，穿著不能太隨便．
2．He mentioned the problem casually with no advertence to its importance．
他隨便地提到那問題，而沒有講述到它的重要性

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