某种群的年龄组成如甲图所示，增长曲线如乙图所示。下列有关叙述正确的是 (  )

短文改错。

    Holidays are fun but they also give thieves a lot of chances steal____  things.Follow my advice, and you will safe____ during holidays. Even though you might be busy shop____, always notice what is going on around you____. You never know when someone might be trying to steal something from you pockets. Don't forget____  your bag in your car. It's also important to take care of your homes during the holidays.

分析史料，回答问题。

材料一：大道之行也，天下为公。选贤与能，讲信修睦。故人不独亲其亲……

材料二：当尧之时，天下犹未平。洪水横流，泛滥于天下。

材料三：禹伤先人父鲧功之不成受诛，乃劳身焦思，居外十三年，过家门不敢入……左准绳，右规矩，载四时，以开九州，通九道。