海尔公司为宣传本公司的产品，在报纸上出了一份关于海尔的题目，全部答对者有奖品赠送，十一到了，海尔在个大商场都推出促销活动，凡在海尔购买产品超过100元的顾客均可参加抽奖活动。

海尔还可以采取哪些销售促进行为？

Applications put computers to practical business (67) , but below the (68) it’s the heart of an operating system-the kernel-that provides the technical wizardry to juggle multiple program, connect to networks and store (69) .
A traditional kernel provides all the functions for applications. The kernel (70) memory, I/0 devices and parcels out processor time.
The kernel also supports security and fault (71) , which is the ability to recover automatically when parts of the system fail.

A．used

B．use

C．apply

D．applied