(1) Meat is rich in protein; vegetables contain vitamins; so the answer is: braised beef; fried carrots, fried cucumbers;

(2) "Fortified iron soy sauce" The "iron" in "iron" does not exist in the form of simple substances, molecules, atoms, etc. The "calcium and iodine" referred to here are elements that emphasize the existence and have nothing to do with the specific form;

(3) Moldy and spoiled food Gutter oil contains toxins and cannot be eaten or fed to poultry and livestock. It will damage human health after use, so choose B;

(4) Glucose reacts with oxygen under the catalysis of enzymes To generate carbon dioxide and water, the reaction equation is: C6H12O6+6O2?Enzyme?.??6CO2+6H2O;

So the answer is: (1) Braised beef, fried carrots, fried cucumbers; (2) Elements; (3) B; (4) C6H12O6+6O2?enzyme?.??6CO2+6H2O.