石莼生活史中有两种植物体，一种是单倍体的______体，一种是二倍体的______体。所以，石莼的生活史具______交替。而水绵生活史中仅具1种______倍体的植物体，合子是唯一的______倍体阶段，因此，水绵仅具______交替，无______交替。

A. By making the audiences feel enlightened and think a lot.
By making the listeners learn what you want to convey.
C. By making the speakcr popular among people of all ages.
D. By convincing the audiences to change their former minds.

A. It can make the speech better understood.
B. It may help win the contest.
C. It can make the audience vigorous.
D. It can make the speaker confident.

A. To caution young people not to send texts while driving.
B. To teach young people how to drive their cars safely.
C. To persuade parents to forbid young people to drive.
D. To popularize knowledge and awareness about security.

A. 合规监测
B. 合规培训
C. 合规政策的制定
D. 合规管理计划的制定与执行