1.take part in 2.turn off
3.pay for 4.the food chain
5. take action 6.public transportation
7.听说 8.处于危险中
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1.[对点训练] ①B ②take an active part in; join us
2.[对点训练] ①A ②afford to pay
3.[对点训练] ①B ②A
[对点训练]
①will be planted
②must be handed
[对点训练]
①Has; watched
②haven't had
1. polluted
2.harmful
3.methods
4.reusable
5. laws
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