B
[2021·福建省高三检测]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 lightblocking 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 lights.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 lightblocking glasses are probably of little use.
4．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.
5．What causes the popularity of blue lightblocking 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.
6．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.
7．According to the text，wearing blue lightblocking glasses may be ________.
A．tiring B．harmful
C．useless D．beneficial
4．C 细节理解题。根据第一段最后一句话“It might be，mainly because as we stare at our devices we are exposing ourselves to blue light.”可知，我们在盯着电子设备的同时，就使自己暴露于蓝光下。故答案为C项“它可能来自电子设备”。
5．B 细节理解题。根据第二段第二句和第三句“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 lightblocking glasses are so popular.”可知，虽然在某些情况下光线确实会损伤我们的眼睛，但是并没有科学证据表明蓝光对我们的眼睛有害。不过许多人仍然认为蓝光有害，这就是防蓝光眼镜如此受欢迎的原因。故选择B项。
6．A 推理判断题。根据第四段前三句“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 lights.”可知，蓝光照射并不罕见。事实上，太阳就是蓝光最大的来源。此外，蓝光也存在于LED灯中。也就是说蓝光照射几乎是不可避免的，答案为A项。
7．C 推理判断题。根据最后一段最后一句“So if eyestrain is the real issue，blue lightblocking glasses are probably of little use.”可知，如果眼疲劳才是真正的问题，那么防蓝光眼镜可能是无用的(useless)。
[2021·福建省高三检测]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 lightblocking 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 lights.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 lightblocking glasses are probably of little use.
4．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.
5．What causes the popularity of blue lightblocking 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.
6．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.
7．According to the text，wearing blue lightblocking glasses may be ________.
A．tiring B．harmful
C．useless D．beneficial
4．C 细节理解题。根据第一段最后一句话“It might be，mainly because as we stare at our devices we are exposing ourselves to blue light.”可知，我们在盯着电子设备的同时，就使自己暴露于蓝光下。故答案为C项“它可能来自电子设备”。
5．B 细节理解题。根据第二段第二句和第三句“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 lightblocking glasses are so popular.”可知，虽然在某些情况下光线确实会损伤我们的眼睛，但是并没有科学证据表明蓝光对我们的眼睛有害。不过许多人仍然认为蓝光有害，这就是防蓝光眼镜如此受欢迎的原因。故选择B项。
6．A 推理判断题。根据第四段前三句“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 lights.”可知，蓝光照射并不罕见。事实上，太阳就是蓝光最大的来源。此外，蓝光也存在于LED灯中。也就是说蓝光照射几乎是不可避免的，答案为A项。
7．C 推理判断题。根据最后一段最后一句“So if eyestrain is the real issue，blue lightblocking glasses are probably of little use.”可知，如果眼疲劳才是真正的问题，那么防蓝光眼镜可能是无用的(useless)。
