在△ABC中，若a=n²﹣1，b=2n，c=n²+1，则△ABC是（　　）

    This story is about a young man. He worked very hard at his lessons, so he was too busy to have a rest. At last, he couldn't go to sleep every night. When he went to bed, he closed his eyes and tried to sleep.But the more he tried, the more he stayed awake.

    After a while, he decided to visit the doctor."I just can't go to sleep at night. What should I do?" "I have a suggestion,"said the doctor, "try counting numbers. By the time you reach one thousand, you'll be asleep. I'm sure of it. The next day the man returned to the doctor's office."well," said the doctor, "How are you today? Did you try my suggestion?"

    The man still looked tired, "Yes,"he said, " I tried counting one, two, three…up to one thousand. But when I reached five thousand and sixty-nine, I began to feel sleepy. I had to get up and drink some tea so that I could go on counting up to one thousand, but then I still couldn't fall asleep.

本实验通过给予小鼠特定的高脂高糖饲料，引起妊娠期肥胖的同时引发GDM．饲料中的脂肪以猪油为主，猪油是一种饱和脂肪酸甘油三酯．

十三年来，在格桑德吉的努力下，门巴族孩子从最初失学率30%，变成今天入学率95%。她教的孩子有6名考上大学、20多名考上大专、中专。村民们亲切地称她为门巴族的“护梦人”。这表明门巴族的乡亲们都认同这样的道理（   ）
①学习是成才的阶梯                           ②受教育能够改变人们的生活和命运
③知识让人生更亮丽                           ④教育能为人的一生的幸福奠定基础

古诗默写。

①独坐幽篁里，____。（《竹里馆》）

②谁家玉笛暗飞声，____。（《春夜洛城闻笛》）

③草树知春不久归，____。（《晚春》）

④《木兰诗》中通过描写军营生活的艰苦环境，侧面衬托出木兰坚强性格的诗句是：____，____。

⑤家乡，是我们精神与情感的栖息地。古今中外，有无数诗人抒写思乡的诗篇。如《木兰诗》中写道“不闻爷娘唤女声，但闻黄河流水鸣溅溅”；又如岑参在《逢入京使》中写道“故园东望路漫漫，____”；再比如“____，____”（课外）的诗句，都表达了游子怀乡思归的情思。