Question

    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(电磁的) 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, clinical spokesman for the American Academy of Ophthalmology,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 issue, blue-light-blocking glasses are probably of little use.

1.What do we know about blue light?

A.It is a kind of nuclear radiation.

B.It has the shortest wavelength.

C.It may come from electronic devices.

D.It consumes a great deal of energy.

2.What causes the popularity of blue-light-blocking glasses?

A.Evidence of their benefits to eyes.

B.Belief in blue light's harmful effect.

C.Widespread use of smart devices.

D.Scientific understanding of blue light.

3.What can be inferred from Paragraph 4?

A.Blue light exposure is hardly avoidable.

B.Eye problems are not easy to deal with.

C.Blue light may connect with tired eyes.

D.Rubbing eyes makes people strained.

4.According to the text, wearing blue-light-blocking glasses may be________.

A.tiring B.harmful

C.useless D.beneficial

Answer

1.C

2.B

3.A

4.C

【解析】

这是一篇说明文。文章主要向我们描述了蓝光是一种能产生大量能量的短波长的电磁辐射类型。人们错误地认为蓝光会对眼睛造成伤害，所以导致了防蓝光眼镜的流行。还解释了眼睛疲劳的真正原因，以及蓝色遮光镜是无效的。

1.细节理解题。根据第一段中It might be mainly because as we stare at our devices we are exposing ourselves to blue light.可知这可能主要是因为当我们盯着我们的设备时，我们把自己暴露在蓝光中。由此可知，蓝光可能来自电子设备。故选C。

2.细节理解题。根据第二段中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.可知虽然光线确实会在某些情况下伤害我们的眼睛，但是没有科学证据表明蓝光对我们的眼睛有害。但许多人仍然认为它是，这就是为什么防蓝光眼镜如此受欢迎的原因。由此可知，人们对蓝光的有害影响的观念导致了防蓝光眼镜的流行。故选B。

3.推理判断题。根据最后一段中In fact, the sun is the largest source of blue light. Moreover, blue light is also present in LED light.可知事实上，太阳是蓝光的最大来源。此外，蓝光也存在于LED灯中。由此可推知，接触蓝光几乎是不可避免的。故选A。

4.细节理解题。根据最后一段中So if eyestrain is the issue, blue-light-blocking glasses are probably of little use.可知因此，如果眼睛疲劳是问题所在，那么防蓝光眼镜可能用处不大。由此可知，戴上防蓝光眼镜可能没用。故选C。