保安员小张和小李在目辬部位流动岗巡查时，发现无证车辆强行进入目辬部位时正确的做法是（）。

A.向客户单位报告后，两人一起阻拦无证车辆进入

B.小李立即向客户单位报告，小张记下车牌、车型和颜色

C.小张和小李一起阻拦无证车辆进入

D.两人记下车牌、车型和颜色

There are 4 card-processing machines in an office. The fastest of these machines processes x cards in 7 hours and the slowest processes x cards in 8 hours. Which of the following could NOT be the average time per machine for each of the 4 machines to process x cards ？（）

A．7.2

B．7.3

C．7.5

D．7.6

E．7.7