The Spring Festival is a festival ______ Chinese people gather together eating dumplings to celebrate the spring’s coming.

A．on which

B．which

C．during which

D．that

下列关于物质分类合理的是：[ ]

A．铅笔芯、橡胶是导体

B．塑料、干木棒、陶瓷是绝缘体

C．铁、冰、玻璃是晶体

D．蜡、食盐、水银是非晶体