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。

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