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六级练习2013.09.14


       
       





Last August, Susan and 42 other students got wet and dirty while removing six tons of garbage from the river running across their city. They cleaned up the river as part of (1)_____________________.
Like one in three American rivers, this river is so polluted that it’s unsafe for swimming and fishing, still, Susan, who has just completed her third summer (2)__________________, scene has changed in this river. “Since we started three years ago, the river is getting a lot cleaner”, she says.
Environmental scientists praised the teenagers for removing garbage (3)_____________________.





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**long environmental camp
on the river clean-up
that can harm wild life

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week long environmental camp

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