She feels so strongly that each of us should have a role _____ in making the earth a better place to live in. [ ]

A. to have played

B. to play

C. to be played

D. to be playing

布设滑坡体变形监测点时，（）

A.坡体上的永久性建筑物上不需布点

B.坡体外相对稳定的地方不需布点

C.主要滑动方向上应该布点

D.水平位移和垂直位移监测分开布点