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信息发布者：
We should be careful of the food we eat.(答案不唯一, 言之有理即可)
B
C
D
B
C
A
A
D
C
D
We should find questions and raise questions and try to deal with the questions. 
I like going hiking. I can learn about many plants when hiking in forests.(答案不唯一,言之有理即可)
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