When you open a file or run a program in a computer, a window appears on the desktop of your computer. The (67) of the window indicates which program you are currently working in arid its color will become blue if a window is active. When you click on The (68) , the window disappears and appears as a button on the taskbar. Clicking on a button in (69) will invoke a specific command.

A．maximize button

B．restore button

C．close button

D．minimize button

对于可逆反应mA(g)十nB(g)pC(g)十qD(g)，若其它条件都不变，只是在反应前是否加入催化剂，可得到如下两种v-t图象。下列判断正确的是（  ）

A．b₁>b₂ t₁>t₂

B．b₁<b₂t₁<t₂

C．两图中阴影部分面积相等

D．图II中阴影部分面积更大