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。根據(jù)句意可知此句需要序數(shù)詞,因前面有物主代詞her,定冠詞the要省略,故選B。the sixth【答案】 B 【解析】【分析】句意:——很高興聽到杰西J最終獲得了歌手之王。C.sixths her _____ time to get the first prize.A.30.— It39。根據(jù) thirty boys,可知是三分之二,因為一般的班容量是4550名學生,故答案是C。你們?nèi)畟€男孩應(yīng)該保護好自己的眼睛。three quarters【答案】 C 【解析】【分析】句意:——爸爸,我們班有45名學生,所有的男孩戴眼鏡,占班級的三分之二。two thirdsone thirdone fourth29.—Dad, there are 45 students in our class, all boys wear glasses, ________ of the whole class. —Oh, that39。two是確切數(shù)字,故選A。thousands of【答案】 A 【解析】【分析】句意:在新建立的學校里大約有2000學生。thousand ofthousandsthousand 【點評】考查基數(shù)詞和序數(shù)詞,注意基數(shù)詞和序數(shù)詞之間的用法區(qū)別。表示幾號樓,如果先說building,那么后面的數(shù)字使用基數(shù)詞,如果數(shù)字在前就是用序數(shù)詞。D.C.B.27.—What should we do now, Mr. Wang? —Please go to Building ________ to wele the ________ new teacher.A.表示一個人的年齡應(yīng)會使用基數(shù)詞,前面不需要冠詞,故答案是A。the twelve【答案】 A 【解析】【分析】句意:今天是我妹妹的生日。twelfthtwelves birthday today. She39。26.It39。A基數(shù)詞,二,B兩次,頻率副詞,C序數(shù)詞,第二,D第二個......,根據(jù) How often,可知提問頻率,故用表示次數(shù)的詞,故選B。D.SecondB.Two注意序數(shù)詞的拼寫和用法。表示某人多少歲的生日,是第幾個生日,應(yīng)該用序數(shù)詞,第九十,ninetieth,故選B。C.ninetieths ______ birthday and we will have a celebration. A.d love to, but it39。 【點評】考查分數(shù)詞的表達法。two thirds【答案】 D 【解析】【分析】句意:大約三分之二的工作將很快被完成。C.two threes of the work will soon be finished. A.23.About根據(jù)語境可知第三屆文化節(jié),是第三次,要用序數(shù)詞the third,三個活動,表示數(shù)量;要用基數(shù)詞three,修飾可數(shù)名詞復(fù)數(shù),故選C。 three【答案】 C 【解析】【分析】句意:——我們的學校打算舉辦第三屆文化節(jié)嗎?——是的。D. threeC. thirdB. thirdactivities.A.注意基數(shù)詞和序數(shù)詞的構(gòu)成。故選B。大約五分之四的學生出生于2002年。D.C.B.of the students were born in 2002. A.21.There are 300 students in Grade Nine. About 【點評】考查分數(shù)的表達和be動詞用法。分數(shù)由基數(shù)詞和序數(shù)詞構(gòu)成,分子用基數(shù)詞,分母用序數(shù)詞,分子大于1時,分母用復(fù)數(shù),所以五分之二的表達為two fifths。Two fifths。Two fifth。Two fifth。Two fifths。 20.根據(jù)可數(shù)名詞復(fù)數(shù)guests和 at least eight people dead and several others ,而其他幾個人失蹤 ,可知總?cè)藬?shù)不確定,因此用固定搭配dozens of,幾十,數(shù)詞的復(fù)數(shù)形式+of,表示概數(shù),故選A。D.C.B. guests sank in the Tigris River in central Baghdad late on Thursday, leaving at least eight people dead and several others mi