Remember when the Blackberry was all the rage, and people worried about straining their 【B1】______ typing on that tiny keyboard?

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问题     Remember when the Blackberry was all the rage, and people worried about straining their 【B1】______ typing on that tiny keyboard? Well, now that the iPhone and other smart phones have【B2】______, there’s the text neck.
    Seriously text neck, as in all that bending over phones and tablets(平板电脑)playing computer games, causing muscles in the neck, shoulders, and even arms and hands to become strained. And all that strain can lead to pain, because the【B3】______and muscles of the neck and shoulders are not meant to be tightened for long periods.
    There’s even been a study on the text neck【B4】______. It found that among 140 students or so surveyed, those who used tablets and smart phones at least three hours a day were more likely to experience neck and shoulder pain than those who used the devices less【B5】______ .
    True, 140 students is a pretty small sample. But the study can have【B6】______ implications. And doctors have been advising people to avoid text neck by not bending over their devices. Instead, try tucking(收拢)your【B7】______ into your side and holding the device up by your chest.
    And, of course, it’s important to【B8】______ from staring into your smart phone’s bottomless【B9】______ playground. There’s even a text neck app that 【B10】______ you when you’re bending over your device and reminds you to straighten up.
【B10】

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答案alerts

解析 此空需填入that所在定语从句的谓语部分。alert“使警惕”,由于先行词是单数名词a textneck app,故alert应用第三人单数形式,词尾勿忘加-s。
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