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D.the fiftieth【答案】 A 【解析】【分析】句意: 活到老,學(xué)到老??栺R克思在他五十多歲時(shí)開始學(xué)習(xí)英語。in one39。s +整十?dāng)?shù)字的復(fù)數(shù)形式表示在某人……歲時(shí),固定搭配,fifty,基數(shù)詞,復(fù)數(shù)是fifties,所以,在他五十多歲時(shí)是in his fifties,故答案為A。 【點(diǎn)評(píng)】考查數(shù)詞的用法及固定搭配。在某人五十多歲時(shí)是in one39。s fifties。14.When Huawei P20 came out, ______ people couldn39。t wait to buy one in our town. A.thousandB.thousandsC.thousand ofD.thousands of【答案】 D 【解析】【分析】句意:當(dāng)華為P20上市時(shí),成千上萬的人迫不及待地想在我們鎮(zhèn)上買一臺(tái)。thousand,千,其前有具體數(shù)詞修飾時(shí),用其單數(shù)形式,當(dāng)其前沒有具體數(shù)詞修飾時(shí),用其復(fù)數(shù)形式,且和of連用,thousands of,成千上萬,這里沒有具體數(shù)詞修飾,故選D。 【點(diǎn)評(píng)】考查整數(shù)的表達(dá)。注意識(shí)記thousand的用法。15.The headmaster39。s office is on the floor. A.oneB.twoC.thirdD.three【答案】 C 【解析】【分析】句意:校長(zhǎng)的辦公室在三樓。one一個(gè),two兩個(gè),third第三,three三個(gè)。根據(jù)句意可知,此處需要填入的意義為第三層,故應(yīng)該用序數(shù)詞,故選C。 【點(diǎn)評(píng)】考查了序數(shù)詞與基數(shù)詞辨析,注意兩者意義的區(qū)分。16.Tim likes collecting coins, and he39。s got ______________ them. A.million ofB.millions ofC.two million ofD.two millions of【答案】 B 【解析】【分析】句意:Tim喜歡收集硬幣,他已經(jīng)得到了它們中的數(shù)百萬。表示確切數(shù)字時(shí)用基數(shù)詞+million,幾百萬;表示非確切數(shù)字時(shí)用millions of,數(shù)百萬的,固定搭配,故選B。 【點(diǎn)評(píng)】考查數(shù)學(xué)詞表達(dá),注意平時(shí)識(shí)記確切數(shù)字與非確切數(shù)字的表達(dá)。17.Li Hua is going to be an elder brother. His parents are planning to have their ________child. A.firstB.secondC.oneD.two【答案】 B 【解析】【分析】句意:李華要當(dāng)哥哥了,他的父母計(jì)劃生二胎。A第一,B第二,C一,D二,限定詞+序數(shù)詞+名詞,第幾個(gè)......,選項(xiàng)C和D是基數(shù)詞,故排除,根據(jù) Li Hua is going to be an elder brother,可知是二胎,及第二個(gè)孩子,故選B。 【點(diǎn)評(píng)】考查數(shù)詞,注意根據(jù) Li Hua is going to be an elder brother的語境選擇序數(shù)詞的用法。18.Last week, five ____ students took part in the sports meeting in our school A.thousandsB.hundredC.hundreds ofD.thousands of【答案】 B 【解析】【分析】句意:上周,我們學(xué)校5百名學(xué)生參加了運(yùn)動(dòng)會(huì)。根據(jù)句子前面有five,可知hundred后面不加s,hundreds of和thousands of前面不用數(shù)詞修飾,故選B。 【點(diǎn)評(píng)】考查數(shù)詞辨析,注意hundred的用法。19.Ten years ago the population of our village was that of theirs. A.as twice large asB.twice as