This paper investigates the nutritional methods of organisms, including autotrophic and heterotrophic, and makes a comparative summary.

Solution: Mushrooms belong to fungi. The basic structure of fungi is cell wall, cell membrane, cytoplasm and nucleus, without chloroplasts. So mushrooms have no chloroplasts, and it is impossible to make organic matter through photosynthesis. The way of nutrition is heterotrophic, which decomposes the ready-made organic matter in the remains of animals and plants to rot. Both laver and green algae have chloroplasts, which can be used for photosynthesis. The nutrition mode is autotrophic, which does not meet the problem. Viruses have no cell structure. It is mainly composed of internal nucleic acid and external protein shell, and all viruses are parasitic. The cells of Aspergillus flavus have cell walls, nuclei, cytoplasm and cell membranes, belonging to fungi without chloroplasts, so the nutrition is the same as that of mushrooms.

So choose: D.

Correctly judge the species of organisms and see whether there are chloroplasts in the body, whether they are autotrophic or heterotrophic, parasitic or saprophytic,