LESSON 23 Susan and 42 other students American

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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 _____________________.

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 __________________, 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 _____________________.
  

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laura6688

1 a week-long environmental camp
2 on the river clean-up
3 they cann't harm wild life

嘻游记

1。a week-long environmental camp
2.on the river clean-up
3.that can harm wild life