Rainforests _____ and burned at such a speed that they will disappear from the earth in the near future.      [ ]

A. cut    

B. are cut  

C. are being cut  

D. have been cut

区域勘探部署中，在调查区域地质条件的基础上，要着重研究（）。

A.生油条件

B.盖层条件

C.储集层物性

D.断层类型