题目

阅读理解     We humans love to stare into our smart devices. We gaze for hours—about 10 hours and 39 minutes a day—at our computers, smartphones, tablets and televisions. Is all this staring bad for us? It might be, mainly because as we stare at our devices we are exposing ourselves to blue light.     Blue light is a type of electromagnetic radiation with a very short wavelength that produces a high amount of energy. While it's true that light can damage our eyes under certain circumstances, there's no scientific evidence suggesting that blue light is harmful to our eyes. But many people still think it is, which is why blue—light—blocking glasses are so popular. So, do the glasses work?     "Everyone is very concerned that blue light may be causing damage to the eye, but there's no evidence that it may be causing serious damage," Dr.Rahul Khurana, a clinical spokesman, told Business Insider.     Blue light exposure is nothing new. In fact, the sun is the largest source of blue light. Moreover, blue light is also present in LED light. But if blue light isn't harmful, then why are we constantly rubbing our eyes when we're looking at our screens? The answer is eyestrain(眼疲劳). More than 60 percent of people experience eye problems associated with digital eyestrain. And blue light, it seems isn't the cause. Instead, our eyes are so strained because most of us blink less when we stare at our digital devices. So, if eyestrain is the real issue, blue-light-blocking glasses are probably of little use. （1） What do we know about blue light? A . It has the shortest wavelength. B . It's a kind of nuclear radiation. C . It consumes a great deal of energy. D . It may come from electronic devices. （2） What causes the popularity of blue-light-blocking glasses? A . Evidence of their benefits to eyes. B . Widespread use of smart devices. C . Belief in blue light's harmful effect. D . Scientific understanding of blue light. （3） What can be inferred from Paragraph 4? A . Rubbing eyes makes people strained. B . Blue light exposure is hardly avoidable. C . Blue light may connect with tired eyes. D . Eye problems are not easy to deal with. （4） According to the text, wearing blue-light-blocking glasses may be _______. A . useless B . harmful C . tiring D . beneficial 答案： D C B A

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