星期四,蔡老师布置给全班同学一项作业:明天早晨,每人带两个鸡蛋,看谁在一天内把鸡蛋保存得完好无缺。同学们听了都很高兴。第二天清晨,妈妈给我买了几个鸡蛋。我好奇地问:“冰箱里不是有鸡蛋吗?干啥还要买鸡蛋?”妈妈说:“咱们家的是笨鸡蛋,又贵又容易破。而洋鸡蛋的蛋壳又厚又硬又结实。”但我心里还是放心不下, On Thursday, Mrs. Cai arranged an assignment for classmates: each morning with two eggs, to see who kept the eggs intact in a single day. Students are happy to hear. The next morning, my mother bought me a few eggs. I curiously asked: “Is not there an egg in the refrigerator? Why do we have to buy eggs?” My mother said, “Our family is a stupid egg, expensive and easy to break, and the shell of a foreign egg is thick, hard and strong. ”But my heart is still not worried,