This selection leads one to believe that the Earth ______.

A．never gets hit by meteors

B．always gets hit by meteors

C．was hit by meteors some time in the past

D．may be bombarded by meteors in the near future

业务运营风险管理系统的特点有数据分析、管理科学、流程导向、（）。

A.计量

B.风险收集

C.良性循环

D.评估