【答案解析】Chopsticks are the most distinctive eating tool at the Chinese dining table. For thousands of years we Chinese have always regarded chopsticks as the simplest possible and the most efficient tool for transporting food from a bowl to the mouth. Chopsticks, which are roughly uniform in size throughout China, can be made of a variety of materials, including bamboo, wood, ivory, plastic, aluminum, silver and gold. Special long bamboo chopsticks are generally used in the kitchen. In the past, wooden chopsticks inlaid with silver thread were used to test whether poison was put in a meal, since silver reacts to a number of poisonous substances by changing its color.