3.介詞between和among的區(qū)別

　　解題要點(diǎn) between表示二者之間，among表示三者或更多的整體概念。當(dāng)A、B、C、D四項(xiàng)選擇答案中出現(xiàn)between或者among時(shí)，它通常就是此題的命題焦點(diǎn)。

　　全真例題分析
（1） The determination of the path of Mars's orbit in 1609 became the unifying link among the two formerly separate realms of physics and astronomy.

(答案) C among改為between

（2） The Carlsbad caverns, located in New Mexico, rank between the largest underground labyrinths in the world.
(答案) B between改為among。表示多數(shù)概念，或范圍時(shí)應(yīng)用among。

（3） For a long time cotton ranked first bctween Alabama's crops, but today it accounts for only a fraction of the agricultural production.
(答案) A between改為among。表示范圍時(shí)應(yīng)用among。