题目

阅读下面短文，在空白处填入 1 个单词或括号内所给单词的正确形式。The use of chopsticks has been【1】big part of Chinese food culture for centuries.When cooking food or picking it up, a pair of chopsticks always comes for use.So how did chopsticks come into being? It’s said that a leader of ancient China, Dayu, 【2】 helped his people fight floods, invented them. In those days, people 【3】(eat) only with their hands. But Dayu was busy 【4】 (prepare) for flood control work and often had his meals in the wild. In the summer【5】 particular, he hurried to 下列图像表达正确的是A.等质量锌粉与足量盐酸反应B.氢气与氧气反应中的能量变化C.气态氢化物沸点D.催化反应与非催化反应过程中的能量关系