3.D　根据第一段末的“serotonin,which makes the itching more intense”及此空前的“serotonin...moving from pain-sensing nerve cells to those that influence itch intensity”可推断,挠痒痒的结果是使血清素从有痛感的神经细胞转移到影响痒的强度的神经细胞,从而使人感觉更痒。故D项正确。

　　4.E　E项与下文的“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...”相呼应。

　　5.B　B项与上文的“The researchers are looking for other ways to break the cycle so they can help people with itchy conditions.One possibility...”相呼应。

　　.Dear Professor White, 

　　I’m Li Hua,chairman of the Students’ Union of Xinhua Middle School,which is close to your university.I am writing to invite you to serve as the judge of our English speech contest.It starts at 2 pm next Friday in the school hall and lasts three hours.And the topic of the contest is “Learning to be grateful”. 

　　Other judges are all the English teachers in our school.I’d appreciate it if you could set aside some time and attend our contest.As a respected expert,you are expected to deliver a summary speech after the contest.Please contact me if you have any questions.

　　We are looking forward to seeing you at the contest.

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