如果覆盖南极的冰原全部融化，海平面将上升多少？
参考答案：
超过60米。
We're very tired. Let's stop _______.
A. having a rest
B. have rest
C. have a rest
D. to have a rest
质押是指债务人或第三方不转移对财产的占有，将该财产作为债权的担保。( )
