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1.(2017·全国卷Ⅰ，65)As ________ result, people will eat more food to try to make up for that something missing.
答案：a as a result是固定搭配，意为“结果”，强调某种原因产生的结果。
2.(2017·全国卷Ⅱ，64)This included digging up the road, laying the track and then building a strong roof over ________ top.
答案：the此处特指“顶部”，故用定冠词the。
3.(2017·全国卷Ⅲ，62)Instead, she is earning ￡6,500 a day as
________ model in New York.
答案：a句意：相反，她在纽约做模特每天收入6,500英镑。model是可数名词，在此表示泛指，且读音以辅音音素开头，故用不定冠词a。
4.(2016·全国卷Ⅱ，48)Give your body and brain a rest by stepping outside for ________ while,exercising, or doing something you enjoy.
答案：a for a while “一会儿”，固定搭配。
5.(2016·全国卷Ⅱ，短文改错)In that case, we will learn little about ________ world.
答案：the句意：那样的话，我们将会对这个世界了解甚少。world属于表示世上独一无二的事物的名词，其前应用定冠词。
6.(2016·全国卷Ⅰ，阅读A)In 1931, Addams became ________ first American woman to win theNobel Peace Prize.
答案：the序数词前面加定冠词the。
7.(2016·浙江高考，2)________ prize for the winner of the competition is ________ twoweek holiday in Paris.
答案：The; a句意：这次比赛的获胜者奖是去巴黎为期两周的休假。第一空，“比赛的获胜者奖”为特指，故应用定冠词the；第二空，泛指“一次两周的休假”，故应用定冠词a。
8.(2016·北京高考，完形)It was ________ cold January in 1925 in North Alaska. The town was cut off from the rest of the world due to heavy snow.
答案：a句意：这是阿拉斯加北部1925年一个十分寒冷的一月份。这个小镇因一场大雪而与外界隔绝。表示星期、月份的名词前一般不用冠词，但如果其前面有形容词修饰时则需用不定冠词，泛指某个星期几或某月份。
9.(2015·重庆高考，3)I just heard ________ bank where Dora works was robbed by ________ gunman wearing a mask.
答案：the; a句意：我刚刚听说Dora工作的银行被一个持枪蒙面歹徒抢劫了。第一空为特指，表示“Dora 工作的那家银行”；第二空为泛指，表示“一个持枪蒙面歹徒”。
10.(2015·江苏高考，33)—Why didn't you invite John to your birthday party？
—Well, you know he's ________ wet blanket.
答案：a句意：——你为什么不邀请约翰参加你的生日聚会？——唉，你知道他是一个令人扫兴的人。固定搭配a wet blanket 意为“令人扫兴的人或物，煞风景者”，不定冠词表示泛指。
一、不定冠词的用法
1.泛指同类人或物中的任何一个，相当于any。
A horse has four legs.
2.泛指同类中的某一个人或某物。
Her father is an English teacher.
I need an iPhone.
3.泛指不确定的某一个，相当于a certain。
A Mr Lee is waiting for you at the school gate.
4.表示“一”或“每一”，相当于one或者every。
I have a mouth, a nose and two eyes.
They have 13 classes a week.
5.用在意义具体化的抽象名词和物质名词之前。
What you do with it will make you a success or failure.
If you can give her a surprise every time you meet her, it will be a plus for you.
6.表示独一无二的名词前有形容词修饰时，其前需用不定冠词。
a rising sun 一轮冉冉升起的太阳
a full moon 一轮满月
a peaceful world 一个和平的世界
7.表示季节、星期、三餐名称的名词前有形容词修饰时，其前需用不定冠词。
a cold winter 一个寒冷的冬季
a rainy Monday 一个阴雨绵绵的星期一
a delicious supper 一顿美味晚餐
8.用在序数词前表示“再一”，“又一”。
She thanked him a second time.
注意：下句中“a first”表示“第一名、冠军”。
He is a top student in our class, and he often gets a first in maths.
9.用于某些固定词组中
