患者，女，32岁，间断四肢关节疼痛5年，近来感乏力、食欲不振、心悸、气短，肝肋下一指

“全国十佳好少年”、安徽省肥东县初级中学七年级学生谭海美，年幼遭遇父母离异，跟着爷爷奶奶艰难度日。她靠捡破烂攒起的学费勤奋读书，用柔嫩的身躯照顾着年迈的爷爷奶奶，将爱心洒向身边每一个像她一样的“留守儿童”，她用刚毅、顽强、自强不息写就了五彩缤纷的花样年华。请回答：

（1）我们青少年应该向她学习什么？

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（2）运用所学知识，谈一谈我们应该怎样培养自己坚强的意志。

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When you take a walk in any of the cities in the West, you often see a lot of people walking dogs.    48   is still true that a dog is the    49   useful and faithful animal in the world,    50   the reason why people keep a dog has changed. In the old days people used to train dogs to protect themselves against animal attacks. And later they came to realize that a dog was not    51    useful for protection but willing to obey his master. But now people in the city need not protect themselves against attacks of animals.    52  

do they keep dogs, then? Some people keep dogs to protect themselves from robbery. But the most important reason is    53   companionship. A dog is his best friend for

   54   child when he has no friends to play with. For young couples, a dog is their child when they have    55   children. For old couples, a dog is also their child when their real children have grown up.

属于慢性根尖周炎的是（）

A.根尖囊肿

B.致密性骨炎

C.根尖肉芽肿

D.牙周脓肿

E.骨膜下脓肿

探索民主革命时期青年知识分子道路问题的小说是（）

A.《不能走那条路》

B.《李双双小传》

C.《青春之歌》

D.《红旗谱》

海水淡化的物理方法不受气候影响，但是成本高。（）