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Everyonehasseenplantsgrowing,buthaveyoueverthought61.  ...

  • Everyonehasseenplantsgrowing,buthaveyoueverthought61.  ...

  • 问题详情：Everyonehasseenplantsgrowing,buthaveyoueverthought61.       theygettheirfood?Intheseventeenthcentury,62         EuropeanscientistcalledVanHelmotaskedthisquestion.Likemostpeople,hethoughtplantsgettheirfoodfromsoil.However,hedec...
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