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Among the following organisms, () A. Nitrifying bacteria B. Cyanobacteria C. Green plants D. Flammulina velutipes.
A, nitrifying bacteria belong to chemoautotrophic organisms, and A is wrong;

B, cyanobacteria belong to photoautotrophic organisms, and B is wrong;

C, green plants belong to photoautotrophic organisms, and C is wrong;

D Flammulina velutipes can't make organic matter, but can only use ready-made organic matter, which belongs to heterotrophic bacteria. D is correct.

Therefore, choose: d.

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