On stepping into his room he was astonished to find the floor covered with _____looked like tiny insects.

A．that

B．something

C．what

D．anything

如图所示是某种物质熔化时温度随时间变化的图像，由图像可判断出这种物质是_________（填“晶体”或“非晶体”），这种物质的熔点是__________，从刚刚开始熔化到完全熔化大约持续的时间为___________。