81. The American clipper ship era was of duration short, extending from about 1845 to 1859. 答案：B

分析及考點(diǎn)：詞序的顛倒，應(yīng)該改成short duration.只有特殊情況修飾成分后置。

參考譯文：美國的剪帆船的時期經(jīng)歷時間很短，只有從1845到1859.

82. Crystals of pure quartz, usually called rock crystal, are coarseness, colorless, and transparent.

答案：D

分析及考點(diǎn)：平行對稱結(jié)構(gòu)，詞性不對稱，所以coarseness名詞應(yīng)改成coarse

參考譯文：純凈石英的結(jié)晶，通常稱為巖石水晶，是粗糙的，無色的，透明的。

83. Of 120 minerals known to have been used as gemstones, only about 25 are in common use in today jewelry.

答案：D

分析及考點(diǎn)：詞序的問題。應(yīng)該改成jewelry today.

參考譯文：在作為寶石使用的所知道的120種礦石中，只有25種是現(xiàn)在珠寶業(yè)通常使用的。

84. One of the thirteen original state of the United States, North Carolina lies on the Atlantic coast midway between New York and Florida.

答案：A

分析及考點(diǎn)：名詞單復(fù)數(shù)使用錯誤。應(yīng)該用復(fù)數(shù)states.看到one of the.

參考譯文：北卡羅來那州是最初組成美國的13個州中的一個座落在大西洋岸邊，在紐約州和佛羅里達(dá)州的中間。

85. The various peoples who developed North America have made it a world leader economic .

答案：D

分析及考點(diǎn)：詞序的顛倒。改成economic leader

參考譯文：發(fā)展北美的多個民族把北美建設(shè)成了全世界的經(jīng)濟(jì)領(lǐng)袖。

86. The Milky Way is a flat spiral galaxy who contains an estimated 100 billion stars, including the Sun.

答案：B

分析及考點(diǎn)：定語從句連接詞的誤用，應(yīng)改為which

參考譯文：銀河系是一個扁平的螺旋星系，它包含有估計100億顆恒星，包括太陽。

87. The piano as it is known today represents a long series of experiments extend back to the year 1711, or perhaps even earlier.

答案：C

分析及考點(diǎn)：詞性誤用。應(yīng)該改成extending.

參考譯文：今天所知的鋼琴代表了一系列的實(shí)踐，一直可以追溯到1711，或者更早。

88. Climate is the primarily force that distinguishes one biome, or major terrestrial region, from another.

答案：B

分析及考點(diǎn)：詞性誤用，修飾名詞用形容詞，所以改成primary

參考譯文：氣候是一個主要的因素來區(qū)分生物群或者主要陸地相互之間的不同。

89. Prehistoric villagers tended to work harder, suffer from more diseases, and eat the poorer diet than nomadic hunters did.

答案：D

分析及考點(diǎn)：冠詞誤用。比較級前不用加定冠詞the，直接用poorer diet就行

參考譯文：史前的村民們傾向于努力工作，防除疾病，和吃比游牧的獵人少的食物。

90. A major Canadian city, Montreal is second only to Paris as the most largest French-speaking city in the world.

答案：D

分析及考點(diǎn)：最高級表述有誤。Largest已經(jīng)是最高級了，前面不用再加most

參考譯文：加拿大主要的城市蒙特利爾，是世界上僅次于巴黎的第二最大法語城市。