--- The T-shirt I received is not the same as is shown online.

--- ______? But I promise you we’ll look into it right away.

A．Who says

B．How come

C．What for

D．Why worry

对于任何一个化学平衡体系，采用以下措施，一定会使平衡移动的是 [ ]

A．加入一种反应物

B．升高温度

C．对平衡体系增加压强

D．使用催化剂