C. How to Pick up Leftovers on College Campuses
D. Waste Problems in University of Maryland
C
Tears are nature’s way of making us feel more comfortable. When our eyes is made uncomfortable by some small pieces of pollution , or when we are cutting onions, or when we are exhausted and “red-eyes” from over work and late hours, tears form in our eyes to clean and refresh them.
Tears are also a sign of strong emotion. We cry when we are sad and we cry when we are happy.
And tears seem to be uniquely human. We know that animals also experience emotion fear, pleasure, loneliness, but they do not shed (流) tears.
Biologically speaking, tears are actually drops of saline fluid, which is a little bit salty, produced by a gland (腺) in the body. Because salt is an important component, tears may actually constitute the most conclusive evidence that the human animal is the end product of a long evolutionary process that began in the sea.
And it is clear that, in addition to the emotional benefits, the shedding of tears has a specific biological function as well. Through tears, we can eliminate from our body certain chemicals which build up in response to stress and create a chemical imbalance in the body. Crying actually makes us feel better by correcting that imbalance and making us feel good again. And thus the emotional and the biological functions of tears merge(合并)into one and make us even more "human" than we would otherwise be.
【2017届河北省高三英语一轮复习55分钟课堂练习29 Word版含答案】相关文章:
★ (全国通用)2014届高考英语一轮单元复习 限时强化训练一
★ 四川省2016届高考英语一轮复习课时作业(23) Module 5 A Trip Along the Three Gorges 外研版必修4
★ 2017高考四川省广安市英语阅读理解一轮系列训练:18(含解析)
★ 安徽省淮南市2014高考英语一轮单项选择及文章训练(19)及答案
★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (58)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:3(含解析)
★ 2017届河北省高三英语一轮复习55分钟课堂练习20 Word版含答案
★ 2017高考四川省广安市英语阅读理解一轮系列训练:25(含解析)
★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (57)
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21