高中英语阅读理解拓展练习microliter
At any given moment, about seven microliters of tears are present in each of our eyes-about one-tenth of a drop of waste. You might think they’re nothing more than salt water, but they deliver oxygen and nutrients to our eyes, removing waste, and are signs of some diseases. This means that doctors and maybe, in the near future, you can look for signs of illness by looking at your tears.
Studies have already shown that markers of many serious diseases, such as cancer, can be found in tears. Recently, a technology named TearExo has been developed to screen for breast cancer using tears collected by patients themselves. This would greatly reduce the cost of testing and help detect the serious disease earlier.
Tear testing could also have an impact on COVID-19: current research has been focusing on developing a test to detect SARS-COV-2 infections (感染) as well as document previous infections, through antibody testing. These tests are typically done with blood—but nucleic acid (核酸) can be detected in tears as well, and antibodies to the virus may also be detected in tears. That means a quick and inexpensive tear test that doesn’t require a needle could be developed in the near future.
But the potential advantages of tears as health signs go beyond occasional testing. One promising tear-based technology is smart contact lenses (隐形眼镜) that continuously monitor a patients biomarkers, significantly improving disease prevention and early detection, which has already attracted the attention of some major companies like Google, and is currently being developed in research laboratories around the world.

One significant step in its development was the first stand-alone contact lenses with an integrated battery, in 2019. More recently, smart contact lenses have been successfully developed for continuous monitoring and treatment of diabetic retinopathy (糖尿病视网膜病变). Such a product probably won’t be ready for market for several years. But according to the Centers for Disease Control and Prevention, about 45 million people in the U.S already wear contact lenses to correct their vision. It would be simple for them to use a smart version.

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This is just the tip of the iceberg when it comes to the potential in tears. Tears can provide an inexpensive, rapid and easy-to-use way to health monitoring. Given the advantages of tear technology, such technology would certainly lead to more effective disease prevention — rather than having to deal with the difficulties of treating them.
1.What can the technology TearExo be used for?
A.Detecting breast cancer more accurately. B.Helping to detect breast cancer earlier.
C.Saving time in breast cancer detection. D.Reducing the pain of breast cancer.
2.What is the third paragraph mainly about?
A.The widespread uses of tears.
B.The latest nucleic acid testing method.
C.Advantages of detecting nucleic acid in tears.
D.Potential applications of tears in nucleic acid testing.
3.What can be inferred about the smart contact lenses?
A.They have a promising future. B.They can protect patients’ eyes.
C.They monitor eyesight continuously. D.They can be bought now on the market.
4.Which can be a suitable title for the text?
A.The role tears play in the eyes.
B.Tears contain high levels of chemicals.
C.Eyes say something about your health.
D.Your tears might save your life someday.

【全文翻译】
隐形眼镜会成为终极电脑屏幕吗？
想象一下，你要做一场演讲，不用低头看笔记，不管你看向哪个方向看，文字都在你眼前滚动。这仅仅只是智能隐形眼镜制造商承诺未来将提供的诸多功能之一。
再想象一下，你是一个音乐家，歌词与和弦都在你的眼前。又或者你是一名运动员，能拥有你的生物统计数据、运动距离，及你需要的其他信息。
研究人员正在研制一种隐形眼镜，可以通过追踪光线水平、癌症相关分子或眼泪中的葡萄糖含量等特定生物标志物，来诊断和治疗各种疾病，从眼疾到糖尿病，甚至癌症。
虽然这些进展令人兴奋，但智能隐形眼镜技术仍需克服许多障碍。其中一个挑战是使用电池供电——显然，这些电池必须极其小。那么，这么小的电池还能提供足够的电力来进行任何任务吗?
自谷歌在2014年推出智能眼镜以来，有关隐私的其他担忧也一直在上演。而这次谷歌智能眼镜的发布也被普遍认为是一种失败。
像所有消费品一样，智能隐形眼镜的成功尚需时日，但所有类型的眼镜终将智能化，已是大势所趋。
参考答案：
1.B
2.D
3.A
4.D

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