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题目材料:

The passage implies that which of the following is true of the bacterial genus Rhizobium?
  • ARhizobium bacteria are found primarily in nitrogen-depleted soils.
  • BSome strains of Rhizobium are not capable of entering into a symbiosis with any plant.
  • CNewly bred varieties of legumes cannot be hosts to any strain of Rhizobium.
  • DRhizobium bacteria cannot survive outside the protected habitat provided by host plants.
  • ERhizobium bacteria produce some ammonia their own purposes.

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