阅读材料：善于思考的小军在解方程组 2x+5y=3, ①4x+11y=5 ② 时，采用了一种“整体代换”的解法：

解：将方程②变形：4x+10y+y=5，即 22x+5y+y=5，③

把方程①代入③得 2×3+y=5，

 ∴y=-1．

把 y=-1 代入 ① 得，x=4，

 ∴ 方程组的解为 x=4，y=-1.

请你解决以下问题：

阅读图文材料，回答下列问题。

凤堰梯田位于陕西省南部。乾隆年间，湖南长沙移民见此地气候温润，森林茂密，与江南相似，于是游说当地农户共同开垦，并逐渐完善梯田灌溉系统一凤堰梯田主要位于山前冲 积扇，在修筑初期，常发生前一天灌满水，第二天就出现干涸的情形，其后先民采用措施加以解决。该梯田现为我国北方省份面积最大的古水稻梯田，已成为旅游胜地。下图示意凤堰梯田位置及景观。

根据材料所给的内容,在下面横线上补写恰当的句子。要求内容贴切,语意连贯,逻辑严密,语句通顺。每处补写不超过15字。

    祥林嫂当然极其不幸,尤其是①____。命运出现了最大的危机。贺老六死去后,无奈中她又投奔了鲁四老爷家。鲁四老爷和鲁家太太也还勉强能容纳她,只是忌讳她“不祥”，②____；他们最后解雇祥林嫂，主要是因为她变得神经质地唠叨,他们觉得那是一个人完全不中用了的症状，所以，③____，并在寒冬里,以“天问”式的自言自语,倒毙在了荒街野巷。

完形填空

   Nancy is reading an e-mail from her friend Jack. She is very1 to get the e-mail. Jack writes about his school2 his weekends. Jack likes his school very much. Nancy likes her school,3 . Jack's school is very big and he likes his classroom. The4  and chairs are new. There are lots of pictures5 the wall. They clean the classroom every day.

   Jack doesn't 6to school at the weekend. He gets up7at six on Saturday. He exercises in the park for half8. Then he eats his breakfast. He helps his mother do the9. At eight he begins to do his homework. He has lunch in a fast food restaurant (快餐店). In the10, he goes shopping with his mum. Sometimes he plays computer games or chats with his friends on the Internet. He enjoys his weekends very much.