Eyeglasses correct many different types of sight problems, including nearsightedness, farsightedness or astigmatism (散光). Trying to understand those different numbers on an eyeglass prescription (驗光單) requires understanding the measurements optometrists (驗光師) use when fitting you for corrective lenses (鏡片).

Diopters (屈光度)
The numbers on your prescription are given in diopters, whose short form is "D". It is used to measure the focusing power, or amount of correction.
O.S. and O.D.
Optometrists use the Latin short form O.S. and O.D. to distinguish between your eyes. O.S. refers to your left eye, while O.D. refers to the right eye.
Generally, your prescription will show a number for O.S. and O.D. (given in diopters). The farther this number is on a number line from zero, the more correction your eyeglasses should provide. A plus sign means the eye is farsighted, while a minus sign means the eye is nearsighted.
Spherical Value
This plus or minus number for each eye is called the spherical value, or the degree of nearsightedness or farsightedness you have. Its short form is "S."
Cylinder
If you have an astigmatism, the optometrist will also measure its degree. The higher the number (given in diopters) marked as the cylinder of astigmatism, (its short form is "C"), the more astigmatism there is in that eye.
Axis
An astigmatism is also measured in terms of its axis, which is a number between 0 and 180. The axis of the astigmatism does not relate to the amount of cylinder, just the location of the irregularity of the astigmatism on that particular eye.
小題1:According to the first paragraph, various sight problems ______.
A.should be understood by the patients
B.can be avoided by wearing corrective lenses
C.should be tested by different optometrists
D.can be corrected by wearing eyeglasses
小題2:If you need a pair of corrective lenses, the optometrist will first value the numbers of ______.
A.DioptersB.Spherical ValueC.CylinderD.Axis
小題3:From the prescription above we can learn that Li Hua ______.
A.is farsightedB.is nearsighted
C.has no astigmatismD.is normal in sight
小題4:The text is probably taken from ______.
A.an education reportB.a school bulletin
C.a local newspaperD.an encyclopedia (百科全書)

小題1:D
小題2:A
小題3:B
小題4:D

試題分析:文章介紹了怎么樣看驗光師的處方,上面的符號和數(shù)字都是什么含義,讓人們更好的了解自己的眼睛,配一副合適的鏡片。
小題1:細節(jié)題:從文章的句子:可知各種各樣的視力問題,可以通過戴眼鏡糾正,選D
小題2:細節(jié)題:從第二段的句子;The numbers on your prescription are given in diopters, whose short form is "D". It is used to measure the focusing power, or amount of correction.可知如果你想配一副適合的鏡片,驗光師會首先驗你的眼睛屈光度,選A。
小題3:細節(jié)題:從第四段的句子:while a minus sign means the eye is nearsighted.可知OS和OD的數(shù)字是負的,說明是近視眼,再根據(jù)李華的處方,可知李華是近視眼。選B
小題4:文章出處題:文章介紹了怎么樣看驗光師的處方,上面的符號和數(shù)字都是什么含義,讓人們更好的知道這些知識,所以應該是百科全書里面的內容。選D
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Mom was right!If you say thank you,for even the smallest gift or slightest show of kindness,you’ll feel happy.
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科目:高中英語 來源:不詳 題型:完形填空

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A.lazyB.shockedC.ashamedD.tired
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A.proofB.feelingC.excuseD.explanation
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A.suddenlyB.slowlyC.proudlyD.quickly
小題6:
A.watchB.recognizeC.lookD.sense
小題7:
A.putting awayB.stopping fromC.sitting upD.holding back
小題8:
A.turnedB.litC.increasedD.rose
小題9:
A.throughB.againstC.upD.to
小題10:
A.carefullyB.politelyC.tightlyD.thoughtfully
小題11:
A.feelingB.reachingC.watchingD.sensing
小題12:
A.breakB.contentC.understandD.fall
小題13:
A.stillB.thereforeC.yetD.however
小題14:
A.muchB.hugeC.littleD.more
小題15:
A.cutB.hurtC.defeatD.wound
小題16:
A.memoryB.supportC.comfortD.kindness
小題17:
A.offeredB.paid forC.contributedD.supplied
小題18:
A.sadlyB.simplyC.excitedlyD.worriedly
小題19:
A.hardB.pleasantC.seriousD.different
小題20:
A.workB.writeC. typeD.sell

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