Test analysis: a meets the meaning of the question. Gold in the futures market is a commodity, because commodities are labor products for exchange. B does not conform to the meaning of the question, and the materials do not involve the value of goods. C does not meet the meaning of the question, and the nature of money is not involved in the materials. D does not meet the problem, gold is a commodity, valuable and has storage means.

Comments: This test requires students to master the meaning of goods. Commodities are products of labor used for exchange. The two basic attributes of commodities are use value and value. The difficulty of this question is moderate, and the ability of students to analyze according to book knowledge and materials is examined.