雅思

雅思雅思阅读阅读素材文章
北京上海天津重庆更多

2019年雅思考试考前必看阅读素材2

2019年08月16日 15:58:48来源:雅思考试网
导读:大家对雅思考试并不陌生,阅读是考试中必考的一部分,想要在考试中获得高分就要把阅读做好,小编真理了这篇雅思考试阅读素材,一起来看一下吧!

相信大家对考试并不陌生,但是想要有一个好成绩,练习是必不可少的,小编在坦途网雅思考试频道为大家整理了这篇考试试题,这里还有很多雅思考试时间整理,希望能够对大家的备考有帮助,想要获得高分的考生快来看看吧!

Hair is curly or straight, depending upon the number of disulfide bonds between hair proteins found in the hair shaft(毛干).

The greater the number of links, the curlier the hair, and the fewer the number of links, the straighter the hair.

Hair is primarily composed of keratin(角蛋白), a protein, which grows from a sac called the follicle. Cells in the hair follicle generate keratin, and various other proteins, which become a part of the hair shaft. These proteins contain sulfur atoms, and when two of these sulfur atoms pair up and bond, they form a disulfide bond. If the two sulfur atoms in the same protein are at a distance, and join to form the disulfide bond, the protein will bend.

The amount of humidity in the air not only makes for what some label a "bad hair day," but alters the degree of curliness or of straightness of hair. This occurs when high humidity forces water back into the hair fiber, acts on its protein structure, and forces the hair shaft to return to its original structure.

People can temporarily alter their hair to force it into a straight state, or a curly state, but only on a temporary, not on a permanent, basis. When a straight-haired person gets a "permanent wave," known as a "perm(烫发),"he or she is chemically forcing the making of strong disulfide bonds. The wave does not stay permanently, because new hair, which is straight, grows in as the "perm" grows out. People with curly hair may chemically alter their hair to give it a straighter appearance, but this, too, is also a temporary solution to a permanent "problem," with the same end result.

以上就是小编为大家整理的全部内容了,阅读是极具灵活性的一项考试,我们要掌握扎实语法知识,还要有强大的词汇库,所以在复习时我们更要加倍的努力,小编作为大家坚强的后盾,会不断为大家整理更多相关内容,希望在今年的雅思考试中,大家都能取得优异的成绩!

温馨提示:因考试政策、内容不断变化与调整,坦途网提供的以上信息仅供参考,如有异议,请考生以权威部门公布的内容为准!

雅思培训课程免费试听

预约免费体验课

教育顾问会第一时间安排您的体验课!

课程预约立即提交
最新文章
电话咨询在线咨询资料领取