1) is metal a conductor a) yes b) no c) sometimes 2) Does plastic come from Nature a) No b) yes c) sometimes 3) Is glass transparent a) no b) sometimes c) yes 4) is wood a insulator a) no b) sometimes c) yes 5) Is freezing a reversible change a) yes b) no c) sometimes 6) is Plastic waterproof a) yes b) no c) sometimes 7) What is sieving a) A mixture made from solid particles b) Separating a mixture of sand and water

Learning

由
打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？