A:①②③
B:①③④
C:①②④
D:②③④
—I will visit my grandparents in Beijing next month. Could you please tell me______?
—Oh, you may take the subway there.
____
如图,是某种物质熔化过程中的“时间—温度”图像,由图可判断该物质是____(选填“晶体”或“非晶体”)。