题目内容
20．Don't throw the rubbish everywhere..分析 大家不要乱丢垃圾．
解答 答案：rubbish
根据该空处在句中作宾语故填入名词，结合首字母r可推知建议大家不要丢垃圾，"垃圾"的英文表达为rubbish为不可数名词，只有单数形式，故答案为：rubbish
点评 做这类题型，首先根据所给单词首字母明确句子所要考查的单词的拼写，再结合相关语法知识对单词做出形式上的变化
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