根据短文理解，选择正确答案。

    There are fifty students in our class. There are twenty-four boys and twenty-six girls. Some students live near the school, and some others live far from school. About half of the students usually come to school by bike. They often get to school at a quarter to seven. About fifteen students often come to school by bus. They often get to school very early, too. Another ten students come to school on foot. Their homes are near the school, but they are often late for school, because they get up late.

根尖的成熟区是植物吸收水分的主要部位，其主要原因是（　　）

依次填入下面一段文字横线处的语句，衔接最恰当的一组是（    ）

今天的日子很短，正在自己的脚下悄悄地流逝。_________，__________。_________，_________，_________，如果总是站在今天望明天，结果明天也会悄悄地溜走，经营好每一个今天就等于经营好昨天和明天。

①今天的事应该今天完成，不能推到明天

②脚踏实地，全身心地经营好今天，才会有一个个实在的昨天

③因此，面对今天，我们不要太多地怀念过去

④接力棒交得好，才能走向辉煌的明天

⑤今天是昨天和明天的接力处