Most scientists seem to agree that _______ certain limit should be set on _______consumption of cars to ease air pollution．

A．a; the

B．/;the

C．the; /

D．the; the

巷道掘进过程中的锚杆预紧力矩的抽检要对当班施工的顶、帮锚杆各抽样一组，一组为（）根。

A、2

B、3

C、5

D、10