人在不同状态下，脉搏、血液量会发生不同的变化．请根据下列图解分析回答问题：

短文改错。文中共有10处语言错误，每句中最多有两处。每处错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。

删除：把多余的词用斜线(﹨)划掉。

修改：在错的词下面画一横线，并在该词下面写出修改后的词。

注意：1）. 每处错误及其修改均仅限一词;

2）. 只允许修改10处，多者(从第11处起)不计分。

Dear Xiaohua,

    It is four days since mother recieves the operation. She is feeling much more better. The doctors told me the operation was successful, but because her old age she had to stay in hospital for other two weeks. The doctors also say it was quite necessary for him to do so. We expect to get a full report in two and three days. Please tell the good news to the rest of the family as soon as possible. You need't come here. I'm able to look at mother by myself. You can send some flower to her. She will feel very happily.

Yours,

Xiaohua

某地野苹果林因遭遇“外来生物”小吉丁虫肆虐，受灾面积高达六成．小吉丁虫将卵产于树干表面，幼虫从果树表皮进入内部蛀食皮层，成虫则以树叶为食，导致果树迅速干枯死亡．

（1）调查小吉丁虫卵的密度可采用____ 法．小吉丁虫产卵需要适宜的温度与光照，温度与光照属于生态系统中的____ 信息．

（2）这片野苹果林构成的群落中，野苹果树最高，居于最上层，各种杂草较矮，居于较下层，说明该群落具有____ 结构；杂草在野苹果树分布较为稀疏的位置比较茂盛，而在野苹果树下则数量很少或者不存在，这说明该群落具有____ 结构．杂草与野苹果树间具有____ 关系．

（3）从野苹果林最初被发现至今，人们为保护野苹果树，大量去除野苹果林中的杂草，人类活动的增强也使野苹果林中的动物大量减少，人类的这些活动使野苹果林的营养结构趋于____，大大降低了野苹果林的____．