A：化学反应过程中都会发生放热现象
B：在化学反应中只有燃烧反应才能放出热
C：人类利用的能量都是通过化学反应获得的
D：化学反应一般伴随着能量变化
—I am really struck by your spoken English. You speak so fluently. Have you been abroad?
—Yes. I ______ in London for two years.
A: pens do you see?
B: Three（）
