My name is Alice I1a student. I get up at6:00 in the2I meet Cindy at school. "3are you?!" she asks. I say, "I'm4, thank you."

    At 8:30, I am in my class. Miss Li asks, "What is that in English?" I say, "It is 5cup." Then she asks, "Can you6it?"  "C-U-P," I say. Bob is 7friend. He likes listening to music (听音乐 ). He has anew8and he listens to9a lot. He can sing many songs10English and Miss Li asks him to sing one for us.

下列材料最能证明“北京人已经会使用天然火”的是（　　）