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问题 单项选择题 A1/A2型题

下列心律失常处理时可应用兴奋迷走神经方法纠正的是（）

A.频发室性期前收缩

B.心室颤动

C.阵发性室上性心动过速

D.心房颤动

E.阵发性室性心动过速

答案

参考答案：C

解析：阵发性室上性心动过速可用兴奋迷走神经的方法纠正。Valsalva动作、按压颈动脉窦、诱发恶心等动作可使心动过速突然减慢至正常。

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Smartphone ,poor sight

Look around and you’ll see people busy on their smartphones. Smartphones do make our lives easier . But have you ever thought about what they mean to you eyes?

According to a study ,half of British people own smartphones and they spend an average of two hours a day using them . There has been a 35% increase in the number of people in the UK who suffer from shortsightedness since smartphones were introduced there in 1997.

Staring at smartphones for long time gives you dry eyes. When looking at something in the distance ,your eyes automatically blink a certain number of times. However ,when you look at things closer  to your face ,the blinking slows down . This reduces the amount of tears and causes discomfort in your eyes. Another bad habit is using  smartphones in dark rooms before going to sleep . If you look at a bright screen while your pupils become larger ,too much light enters your eyes. This can do harm to the eyes and cause a disease called glaucoma.

While you’re probably not going to stop using to your smartphone,there are a few things you can do to protect your eyes. Hold  your phone at least 30 continues away from your eyes when using it. Take a break every hour and try the following :look at something at least five meters from you and then focus on the tip of your nose. Repeat this several times. It should reduce the discomfort in your eyes.
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地震学研究（）的一个学科，是地球物理学的一个分支，它所涉及的尤其是关于对天然地震以及用于油、气、矿物及工程消息的（）的研究。
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