当我们的某些方面受到他人的肯定时，就会显得格外高兴；当做了好事受到集体和社会的赞美和表彰时，心情就十分舒畅。这是因为（ ）

A: Hello!____

B: May I ask who's calling, please?

A:____

B: Hi, Xiaohai. I'm sorry, Jennifer is out at the

Moment. May I take a message?

A: Sorry, I can't hear you.____

B: I said if I could take a message for you.

A: Yes, thank you. Could you ask her to call me back this evening?

B:____

A: Yes, she does, but just in case, it's 85286321.

B:____ Jennifer is coming back.

某岛屿上生活着一种动物，其种群数 量多年维 持相对稳定。该动物个体从出生到性成熟需要6个月。下图为某年该种群在不同月份的年龄结构（每月最后一天统计种群各年龄组成的个体数）。关于该种群的叙述，错误的是