Dr.Vanjara says the best treatments for the pain are daily exercises.“And start stretching it in all the possible directions that you can.” Correct posture can help prevent pain.Dr.Vanjara teaches children how to hold their smartphones correctly.She tells a patient to hold the smartphone in front of the face.She says that bending the head down to look at the device，strains the neck and creates an unhealthy bend to the back.She advises taking breaks from using a smartphone often.Stand up.Stretch your legs，back，shoulders and arms.And when your work or school work is done，unplug(不插电) and exercise.

　　Sadia Vanjara predicts we will see not only physical but psychological and emotional problems resulting from overuse of smartphones.

　　21．What is the best title for the passage?

　　A．Children are fond of playing video games on smartphones.

　　B．Playing video games can make children smarter.

　　C．How to play video games on smartphones.

　　D．Playing too many video games causes neck problems.

　　答案　D　[主旨大意题。本文说明玩太多的手机电子游戏会引起颈部疼痛，进而引起心理上和情绪上的问题。故选D可作文章标题。]

　　22．In order to prove his point of view，the author ________．

　　A．gives some examplesB．makes comparisons

　　C．analyzes the causes D．provides some datas

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