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.

“天生我才必有用”这句话强调         （）                        
①自己天生就是有用之才  ②每个人认识和发挥自己的优势和长处,树立自信心
③每个人都可以自然成为有用之才  ④只要努力，每个人都可以成为有用之才 

品读范仲淹《渔家傲》一词，回答问题。

塞下秋来风景异，衡阳雁去无留意，四面边声连角起。千嶂里，长烟落日孤城闭。

浊酒一杯家万里，燕然未勒归无计，羌管悠悠霜满地。人不寐，将军白发征夫泪。

词的上阙写景，围绕“____”字着笔，勾勒出西北边境肃杀凄凉的秋景，暗含着军事态势的严重；下阙抒怀，慨叹____和____，表现了戍边将士复杂的心态。

下列化石可以证明鸟类可能起源于古代爬行类的是（    ）