根据板块构造学说的观点，在板块张裂地区常形成（ ）
A：高大山脉
B：深海沟
C：裂谷或海洋
D：海岭
－My parents our home for a few hours when I arrived. I didn't meet them.－You could call them if you wanted to know where they were.
下列主体中，不希望发生这一变化的是（ ）。
