题文
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，并在答题卡上将该项涂黑。选项中有两项为多余选项。Eyesight plays a very important role in our daily life. Every waking moment, the eyes are working to see the world around us. Over forty percent of Americans worry about losing eyesight, but it's easy to include steps into our daily life to ensure healthy eyes. Here are five suggestions for a lifetime of healthy eyesight:
· Schedule yearly exams. 小题1: Experts advise parents to bring babies 6 to 12 months of age to the doctor for a careful check. The good news is that millions of children now can have yearly eye exams and following treatment, including eyeglasses.
· Protect against UV rays (紫外线). Long-term stay in the sun creates risk to your eyes. No matter what the season is, it's extremely important to wear sunglasses.
小题2:
Give your eyes a break. Two-thirds of Americans spend up to seven hours a day using computers or other digital products. 小题3: Experts recommend that people practice the 20/20/20 rule: every 20 minutes, take a 20-second break and look at something 20 feet away.
· 小题4: As part of a healthy diet, eat more fruits and vegetables each day. Vitamins (维生素) C and E help protect eyesight and promote eye health.
· Practice safe wear and care of contact lenses (隐形眼镜). Many Americans use contact lenses to improve their eyesight. While some follow the medical guidance for wearing contact lenses, many are breaking the rules and putting their eyesight at risk. 小题5: Otherwise, you may have problems such as red eyes, pain in the eyes, or a more serious condition.A．Eat your greens.B．Eye care should begin early in life.C．They can properly protect your eyes.D．Stay in good shape by taking more vitamins.E. Parents usually don’t care about their own eyesight.
F. Always follow the doctor’s advice for appropriate wear.
G. This frequent eye activity increases the risk for eye tiredness. 题型：未知难度：其他题型
答案
小题1:B
小题2:C
小题3:G
小题4:A
小题5:F
点击查看序数词知识点讲解,巩固学习
解析
拥有健康的视力是每个人关心的事情，这篇文章介绍了五个建议可以让我们终身享有健康的视力。
小题1:考查句意理解和上下文串联。根据下文的句子：Experts advise parents to bring babies 6 to 12 months of age to the doctor for a careful check.医生建议父母到6到12个月大的孩子去医院做视力检查，可知：保护视力应该很早就开始，所以答案是B。
小题2:考查句意理解和上下文串联。根据上文的句子：No matter what the season is, it's extremely important to wear sunglasses.不管什么季节，戴太阳镜都是非常重要的，可知：它们可以适当的保护你的眼睛，所以答案是C。
小题3:考查句意理解和上下文串联。根据上文的句子：Two-thirds of Americans spend up to seven hours a day using computers or other digital products.三分之二的美国人每天花7个小时使用电脑和其他数字产品，可知：这个频繁的视力活动会增加眼睛疲劳的危险，所以答案是G。
小题4:考查句意理解和上下文串联。根据下文的句子：As part of a healthy diet, eat more fruits and vegetables each day.作为健康饮食，每天要多吃蔬菜和水果，可知：多吃绿色的食品，所以答案是A。
小题5:考查句意理解和上下文串联。根据上文的句子：While some follow the medical guidance for wearing contact lenses, many are breaking the rules and putting their eyesight at risk.有人听从佩戴隐形眼镜的医学建议，而有人忽视了这些规定让他们的视力有危险，可知：佩戴眼镜要听从医生的建议，所以答案是F。
考点
据考高分专家说，试题“根据短文内容，从短文后的选项中选出能填入.....”主要考查你对 [序数词 ]考点的理解。序数词
序数词的概念：
表示顺序的数称为序数词。如：first, second, third, fourth。
序数词的构成与用法：
1、序数词的构成：
①一般来说，是由相应的基数词加词尾th构成。
例：four＋th→fourth
six＋th→sixth
seven＋th→seventh
ten＋th→tenth
②下面这些基数词在变为序数词时，有特殊的变化。
例：one→first
two→second
three→third
five→fifth
eight→eighth
nine→ninth
twelve→twelfth
③十位整数序数词的构成方法是将基数词的词y变成i，然后再加eth。
例：twenty→twentieth
thirty→thirtieth
forty→fortieth
ninety→ninetieth
④两位或两位以上的基数词变成序数词时，仅将个位数变成序数词。
例：twenty－one→twenty－first
thirty－five→thirty－fifth
a hundred and fifty－three→a hundred and fifty－third
2、序数词的用法：
①序数词在使用时，一般加上定冠词。
例：the first book
the second floor
the third day
the fourth week．
②序数词在多数情况下都用作定语，有的也可以作表语、主语和宾语。
例：The may1st is Labour Day. 五月一日是劳动节。
My room is on the second floor. 我的房间在二楼。
The first is larger than the secon.（主语）第一个比第二个大。
Read the book from the first.（宾语）从开头读这本书。
You'll be the sixth to write.（表语）你将是第六个写的。
③序数词的前面可以加上不定冠词，用来表示“再一”，“又一”的意思。
例：You may have a third try. 你可以第三次尝试。
序数词知识体系：
约数的表达方法：
用tens/dozens/scores/hundreds/thousands/millions of 表示“几十、几百、上千、成千上万”等。
如：The boy bought dozens of pencils.
Thousands of people died in the earthquake.
注意： (A)：dozen, score, hundred, thousand, million等表示确切数量时，不用复数。
如：five dozen (of) eggs 五打鸡蛋
hree hundred people 三百个人
分数词的构成和用法：
1）分数词构成法：
分数词（FractionalNumerals）由基数词和序数词构成，基数词代表分子，序数词代表分母。除了分子为1的情况下，序数词都要用复数形式：
如：1/4：one-fourth
5/9：five-ninths
2/3：two-thirds
17/5：three and two-fifths
7/12：seven-twelfths
379/8：forty-seven and three-eighths
此外还有下面表示法：
如：1/2：a(one) half
1/4：a(one) quarter
3/4：three-quarters
9/4：two and a quarter
3/2：one and half
31/4：seven and three quarters
