24.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。
25.— Dad, of the apples gone bad.
— Well, we'd better eat up the rest as soon as possible.
A. two-third; have
B. two-thirds; have
C. two- thirds, has
D. two-third, has
【答案】 B
【解析】【分析】句意:——爸爸,苹果有三分之二已经坏了。——我们最好快点吃掉其
余的。分数的表达:分子为基数词;分母为序数词。分子大于一的分母用复数;故排除A
和D;分数修饰名词做主语时,谓语动词与后面的名词的数保持一致;apples是可数名词
复数,故用动词原形。故选B。
【点评】此题考查数词和主谓一致。掌握分数的表达方式和主谓一致的用法。
26.—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。
27.The total number of the citizens in the city has increased to over four _________ this year.
A. million
B. millions
C. a million
D. millions of
【答案】 A
【解析】【分析】句意:这个城市市民总数今年已经增长到了四百万。million意思是百万,当和具体数字连用时,不加s,后面也不加of;而millions of意思是数以百万计的,
固定短语;前面有具体数字four,四,因此用million,故选A。
【点评】此题考查数词。注意hundred,thousand,million的使用规则。
28.About ______ of the earth ______ covered with water, but we have less and less available fresh water.