![English](/tpl/images/cats/en.png)
Adam is writing a research paper about recycling, and he has several potential research questions. which is his best option?
a) how many us cities have recycling programs?
b) why didn’t people start recycling earlier in history?
c) what are the effects of recycling on the environment?
d) which materials are recyclable?
![answer](/tpl/images/cats/otvet.png)
Answers: 2
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Adam is writing a research paper about recycling, and he has several potential research questions. w...
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