纯剪切应力状态下，各向同性材料单元体的体积改变为（）。A．变大 B．变小 C．木确定

There was a big fire in the street last night, but the firemen _______ within twenty minutes.

A．took it out

B．brought it out

C．worked it out

D．put it out

The two brothers carried a ______ bed into the room.

A．double

B．deal

C．slight

D．opposite

—Excuse me, I wonder if you can help. I _______ my ID card.  

—But where did you lose it?