【点评】考查数学词表达，注意平时识记。
24．It's my sister's birthday today. She's ________ years old.
A. twelve
B. twelfth
C. the twelve
【答案】 A
【解析】【分析】句意：今天是我妹妹的生日。她十二岁了。表示一个人的年龄应会使用基数词，前面不需要冠词，故答案是A。
【点评】考查基数词，注意表达年龄时应使用基数词。
25．Alibaba CEO Jack Ma has decided to retire from his company in his _________.
A. fifty
B. fifties
C. fiftieth
D. fiftieths
【答案】 B
【解析】【分析】句意：阿里巴巴的总裁马云已经决定在他50多岁从他的公司退休。in one's +基数词复数，在某人几十多岁时，in one's fifties，在某人五十多岁时，故选B。
【点评】此题考查数词。注意固定短语，in one's fifties。
26．In Yunnan province, there is a valley famous for its butterflies. You will see over four _______kinds of butterflies flying around ________ you get into the valley.
A. hundred; when
B. hundreds of; while
C. hundred; until
D. hundreds; if
【答案】 A
【解析】【分析】句意：在云南省，有一个以蝴蝶闻名的山谷。当你进入山谷时，你会看到有四百多种蝴蝶飞来飞去。数词+hundred，几百，用hundred 的单数形式，hundreds of，好几百，不和数词搭配，故排除B和D；进入山谷和看见蝴蝶之间是并列关系，因此用when，当……时，while表对比，until与not连用，if表假设，均不符题意，故选A。【点评】考查数词和连词，注意根据You will see的语境选择合适的用法。
27．—How many American students came to visit your school yesterday?
— Ten. Seven are from New York, and the other _____ are from Boston.
A. two
B. three
C. four
D. five
【答案】 B
【解析】【分析】句意：——昨天多少美国学生来参观了你们学校？——十个，七个来自纽约，其他的三个来自波斯顿。A.二；B.三；C.四；D.五。一共十个人，七个是纽约的，剩下的三个就是波斯顿的，故答案是B。
【点评】考查数词辨析。主意结合语境思考问题并解决问题。
28．—Hi, Jack! What about playing soccer after school?
—I'd love to, but it's my grandfather's ______ birthday and we will have a celebration.
A. ninetith
B. ninetieth
C. nintieth
【答案】 B
【解析】【分析】句意：——嗨，杰克！放学后踢足球怎么样？——我很乐意，但今天是我祖父的九十岁生日，我们要庆祝一下。表示某人多少岁的生日，是第几个生日，应该用序数词，第九十，ninetieth，故选B。
【点评】考查数词。注意序数词的拼写和用法。
29．—When do you usually go to bed on school nights?
—At around ________ o'clock. It's healthy to fall asleep before 10 p.m.
A. nine
B. ninth
C. twelve
D. twelfth
【答案】 A
【解析】【分析】句意：——上学的晚上你通常什么时候睡觉？——大约9点。晚上10点
之前睡觉是健康的。nine九，是基数词；ninth第九，是序数词；twelve十二，是基数词；twelfth第十二，是序数词。根据o'clock此处表示钟点，用基数词，排除BD两项。根据
It's healthy to fall asleep before 10 p.m.可知，10点之前睡觉是健康的，因此他在9点睡觉，
故答案选A。
【点评】本题考查数词，注意基数词表示几点。
30．Having introduced the new equipment, our factory turned out in 2004 as the year before.
A. cars three times as many as
B. three times as many cars
C. as many cars as three rimes
D. three times more cars than
【答案】 B
【解析】【分析】句意：在引进新设备后．我们的工厂在2004年的产量是前一年的三倍。
倍数+as+形容词+as+，……是……倍，固定搭配，故选B。
【点评】考查倍数的表达，注意倍数+as+形容词+as的用法。
31．How to read 85, 626 in English？
A. eighty-five thousands, six hundreds and twenty-six
B. eighty-five thousand, six hundred and twenty-six
C. fifty-eight thousand, six hundred and twenty-six
D. eighty-five thousands, six hundred and twenty-six
【答案】 B
【解析】【分析】句意：用英语怎样读85, 626？英语数学词的读法是：从右往左每三个数
字是一组，用逗号隔开，从右往左第一个逗号读hundred，百位和十位间用and连接，所
以读作eighty-five thousand, six hundred and twenty-six，故选B。
【点评】考查数学词的读法，注意平时识记其读法规则。
32．Ten years ago the population of our village was that of theirs.
A. as twice large as
B. twice as large as
C. twice as much as
D. as twice much as
【答案】 B
【解析】【分析】句意：十年前，我们村子的人口是他们的两倍。根据句意可知，这里考
查的是表示倍数的句型，twice在这里的意思是两倍，twice as…as，表示是……的两倍，并
且修饰人口众多时用形容词large或big，因此是twice as large as，故选B。
【点评】考查倍数的表达方式。
33．Last week, five ____ students took part in the sports meeting in our school
A. thousands
B. hundred
C. hundreds of
D. thousands of
【答案】 B
【解析】【分析】句意：上周，我们学校5百名学生参加了运动会。根据句子前面有five，可知hundred后面不加s，hundreds of和thousands of前面不用数词修饰，故选B。【点评】考查数词辨析，注意hundred的用法。
34．A year is divided into ______ months. September is the _____ month of the year.
A. twelve, ninth
B. twelve, nineth