Unit 2 Saving the Earth词句精讲精练词汇精讲 1. pollutepollute为及物动词,意为“污染,弄脏”;pollution为pollute的名词形式,意为“污染”,是不
Unit 2 Saving the Earth词句巩固练习I. 单项选择。1.— How long ________ you ________ here?— For about two years s
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