做好材料供应工作的关键是要把握材料供应工作中的（）这一中心环节。
A.施工消耗
B.供应计划
C.组织货源
D.运输和储备
参考答案：C
35．The highest award was given to Anna, who_________so hard on the project for years, and at last her efforts paid off.
A．has worked
B．worked
C．was working
D．had been working
喷油泵供油量不均匀时，柴油机排气管口（）。
A.间断冒黑烟
B.冒白烟
C.间断冒蓝烟
D.冒蓝烟
