People in the southwest of China are in great need of ______ this year because it hasn’t rained for a long time there.

A．food

B．water

C．drinks

D．vegetables

某分部工程有4个施工过程，各分为3个施工段组织加快的成倍节拍流水施工。各施工过程在各施工段上的流水节拍分别为6天、4天、6天、4天，则专业工作队数应为 ( )个。

A．3

B．4

C．6

D．10