I was surprised to know that ________ two top students were caught stealing in the supermarket.

Worse still,  ________ third one was found fighting with others. [ ]

A. the; a  

B. the; the

C. /; a  

D. /; the

在（）条件下，测量地层电阻率时，要受井径、钻井液电阻率、上下围岩及电极距等因素影响。

A、试验

B、井眼

C、地层

D、钻井液