Although Chen conducted his study on mice,the same annoying cycle of itching and scratching is thought to occur in humans.4. Not exactly,says Chen.Serotonin is a neurotransmitter(神经传递介质).It is involved in growth,aging,and mood regulation.Blocking serotonin would have far-reaching effects throughout the body,Chen explains.

　　The researchers are looking for other ways to break the cycle so they can help people with itchy conditions.One possibility:Affecting the communication between serotonin and the nerve cells that transmit the itchy sensation.5. 

　　A.Try to resist scratching it.

　　B.Until then,try not to scratch!

　　C.This pain masks the itchy feeling.

　　D.The result:The itch will be more and stronger.

　　E.So can blocking serotonin make you itch-free?

　　F.If the itch is really bothering you,talk to your doctor.

　　G.Scientists discover why scratching an itch can make it worse.

　　答案与解析:

　　【语篇导读】本文是说明文。文章解释了挠痒痒会越挠越痒的原因。

　　1.A　解析:A项与上文的“Got an itch?”相呼应,并且下文的“Scratching an itch can make it worse...”与A项是因果关系。

　　2.C　解析:C项与上文的“causes a mild sensation of pain”及下文的“Yet pain signals that travel to your brain relieve the itching only temporarily.”相呼应。

【2017届高考英语一轮复习考点规范练：必修4 12 Theme C（重庆大学版）】相关文章：

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修7 unit2《Robots》

★ 2017届高考英语二轮复习大题冲关秘籍短文改错：体验真题（含解析）

★ 【北京专用】2014届高考英语一轮复习方案课时作业：必修3 Unit 5 Canada

★ 2014届高考英语一轮复习课时作业(十二)必修2Module 6《Films and TV Programmes》（外研版）

★ 四川省广安市2014高考英语一轮基础训练题（10）及答案

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (97)

★ 2014届高考英语一轮复习必修4参考答案（外研版）

★ 2014届高考英语一轮复习课时作业(十五)必修3Module 3《The Violence of Nature》（外研版）

★ 【浙江专用】2014届高考英语一轮复习课时作业(五)必修1Unit 5《Nelson Mandela—a modern hero》

★ 【浙江专用】2014届高考英语一轮复习课时作业(十八)必修4Unit 3《A taste of English humour》