题目内容
8.根据短文内容,从短文后的选项中选出能填入空白处的最佳选项.选项中有两项为多余选项.Snowblind--it's a frightening word.Thankfully,it's a condition that is totally preventable.
Snow blindness is a painful,temporary loss of vision due to overexposure to the sun's UV rays.Essentially,snow blindness is caused by a sunburned eye.
(36)AThough it is commonly called snow blindness,the condition can (and often does) occur in the absence of snow.
The terms"snowblind"and"snow blindness"have become popular because snow is highly reflective of ultraviolet radiation.(37)E Also,skiing,mountain climbing and snowboarding usually take place at relatively high altitudes,where the sun's UV rays are stronger.Combined,these factors can double your risk of getting sunburned eyes,compared with being outdoors at lower altitudes in the summertime.
(38)GTelevision journalist Anderson Cooper experienced snow-free snow blindness first-hand a few years ago when he spent a couple hours on a boat in Portugal without sunglasses and ended up"blind for 36hours,"according to his report of the incident.
Not only can you become snowblind without snow--it can happen without sunlight,too!(39)DFor example,sun lamps can cause temporary"snow"blindness if proper eye protection is not used.
(40)FTo relieve pain or discomfort from snow blindness,stay indoors and wear sunglasses.Keep your eyes well-moistened with artificial tears.For additional relief,use over-the-counter pain relievers.Be sure to use only pain relievers you know you can take without worry of an allergic reaction.You also may find that placing a cool,dampened washcloth over your closed eyelids is comforting.
A.You don't need snow to become snowblind.
B.It will likely affect those traveling in snowy conditions.
C.To prevent snow blindness on the slopes,wear sunglasses.
D.Sometimes it occurs from man-made sources of ultraviolet radiation
E..In fact,snow can reflect over 80percent of the UV rays that fall upon it.
F.Snow blindness is scary,but usually it's temporary,and there are ways to relieve the discomfort.
G.But water and white sand also are highly reflective of the sun's UV rays,thus increasing the risk.
分析 "雪盲"是一种很可怕的现象,在没有雪的情况下也会发生,文章介绍了几种可以预防"雪盲"发生的方法.
解答 AEGDF
36.A 细节题.根据后面的句子Though it is commonly called snow blindness,the condition can (and often does) occur in the absence of snow.可知,虽然该词普遍被叫做"雪盲",但是在没有雪的地方也会发生,故选A.
37.E 细节题.根据上一句的介绍The terms"snowblind"and"snow blindness"have become popular because snow is highly reflective of ultraviolet radiation可知,这个术语很流行,因为雪能高度反射紫外线,所以snow can reflect over 80percent of the UV rays that fall upon it这句话说雪能反射80%的紫外线,起到承上启下的作用,故选E.
38.G 上下文语境.根据后一句话Anderson Cooper experienced snow-free snow blindness first-hand a few years ago 可知,这位记者在没有雪的地方也经历了"雪盲",可见,水和白沙也有反射紫外线,增加了这种风险,故选G.
39.D 细节题.从句sun lamps can cause temporary"snow"blindness if proper eye protection is not used.
可知,太阳灯也能造成暂时的"雪盲",推出一些人造的东西也能反射紫外线,故选D.
40.F 概括题.根据这段的内容介绍可知,主要介绍了几种减少"雪盲"发生的方法,故选F.
点评 选句填空应先通读全文,再结合空白处的前后文暗示,选出正确答案.
A. | for | B. | why | C. | when | D. | that |
A.Finally,it has taken a giant leap forward. B.All of the factors pushing online education toward the mainstream of higher education are now crashing together. C.Over the past few years,he has been teaching himself programming. D.In other words,Coursera's approach is a long way from a simple online video lecture. E.Yet the most exciting promise of their company and the like is the role they might play in improving education for the poor around the world. F.Ng's course in machine learning attracted 104,000 enrollees around the world. |
Christos Porios,16,lives in a small Greek city."My mother's a teacher and my father's a mechanic,"he explains,adding that neither is knowledgeable about computers-especially compared with him.(67)C
Porios was taking a free class in machine learning offered by Andrew Ng,a professor at Stanford University,over an online platform Ng developed with his colleagues.Drawing on what he learned,Porios was able to participate in the International Space Apps Challenge,a virtual hackathon (编程马拉松) using data from NASA and other government agencies.
If one teenager in one small city can become a genius hacker through an online course,does it mean the world has changed?We have been hearing about the potential of online education for decades.
(68)A A number of online education platforms have appeared,featuring professors from top universities offering free courses.
(69)F Ng was amazed."It would take me 250 years to teach this many people at Stanford,"he says.And so,just one month into the course,Ng and his Stanford colleague,Daphne Koller,decided to leave their faculty posts (教职) and dive into online teaching full-time.In April,they launched their company,Coursera,with a $16 million round of venture funding.So far,it has managed to team up with 35colleges in nine countries.
To Ng and Koller,Coursera's mission is simple and yet grand.That is to teach millions of people around the world for free,while also transforming higher education.
According to Ng,the world's top 20universities enroll only about 200,000 students.There are million more who could participate in classwork at the higher level,but most of them are far from any of the leading universities.(70)E
Koller says Coursera's total registration has hit 15 million.Porios,the young Greek,is only one of those registrants.His hope is to study in Germany or England someday.He is even toying with the idea of taking classes at MIT or Stanford-but this time in person.