商品的品质包括商品的内在素质和（ ）
A．内在品质
B．物理性能
C．化学成分
D．外观形态
参考答案：D
—What a big storm last night!
—Yes. I was doing my homework. Suddenly, all the lights in my house _______.
A．went off
B．turned off
C．took off
D．got off
变化气质
