What does the passage mainly discuss? The author mentions "seeds and fruits" in line 2 as examples of

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问题  What does the passage mainly discuss?
  The author mentions "seeds and fruits" in line 2 as examples of

选项 A、the first crops cultivated by early agricultural societies
B、foods eaten by hunters and gatherers as a secondary food source
C、types of food that hunters and gatherers lacked in their diets
D、the most common foods cultivated by early agricultural societies

答案B

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