●下图是一个软件项目的活动图，其中顶点表示项目里程碑，连接顶点的边表示包含的活动，则里程碑(6)在关键路径上，活动FG的松弛时间为(7)。

A. The shop promised to change another one
B. The shop promised to repair it if you charge it
C. The shop promised to repair it for free it if it broke down in the first three months.
D. The shop promised to repair it for free it if it broke down in one month.

A. It is impossible for us to stop heart attacks and many people die for it.
B. Advances in medicine help stop many heart attacks and keep people alive.
C. Lifestyle. changes have increased the number of heart attacks.
D. We have the technology to cure all the heart attacks.

A. struck
B. brought
C. forced
D. penetrated

A. enduring
B. suffering
C. bearing
D. experiencing