(1) In the design of A, rice mainly provides sugar, cabbage and apples mainly provide vitamins, fish and soybean milk mainly provide protein, and meat provides protein and oil, which is comprehensive and reasonable.

B Design: Rice and bread mainly provide sugar, while fish mainly provide protein and fat. This recipe has no fruits and vegetables and cannot provide vitamins and other nutrients. This recipe is not comprehensive in nutrition.

(2) There are many kinds of vitamins, which play an important role in human body. Among them, the role of vitamin A is to promote the normal development of human body, enhance resistance and maintain normal vision. When lacking, people will suffer from night blindness, that is, they can't see clearly at night. Animal liver is rich in vitamin A, and plant foods generally do not contain vitamin A, but plant foods such as corn and carrots contain carotene, which can be converted into vitamin A in the human body, so carrots are often eaten.

So, the answer is: (1) a; The main and non-staple foods are reasonably matched; Reasonable collocation of meat and vegetables;

(2) lack of vitamin A; Carrots or appropriate animal livers.