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Among the following four groups of organisms, the most similar cell structures are () A. Amoeba, Hydra, Nostoc flagelliforme B. Tobacco, moss, Spirogyra C. Wheat, Oscillatoria,
A, amoeba and hydra are eukaryotes, Nostoc flagelliforme is prokaryote, A is wrong;

B, tobacco, moss and Spirogyra are all eukaryotes, with the most similar cell structure, and B is correct;

C, wheat and soybean are eukaryotes, oscillatoria is prokaryote, and C is wrong;

D, yeast is eukaryote, lactic acid bacteria and actinomycetes are prokaryotes, D is wrong.

Therefore, choose: B.