I限定词和被限定词间的呼应
一、 冠词与所修饰名词间的呼应
1. 不定冠词a／an表示“一个，一部分”，与之匹配的是名词的单数形式，不管a／an与它所修饰的名词之间有多少个限定成分，都要遵循这一规则
1) A significant proportions ［A］ of the plants and animals of ［B］ Hawaii exists nowhere else ［C］ in the world ［D］ .
2) The discovery ［A］ of kerosene and the invention of a glass ［B］ chimney made possible ［C］ a greatly improved lamps ［D］ .
3) Jim Thorpe， a football ［A］ ，track，and baseball stars ［B］ from Pennsylvania，is considered by many ［C］ to be the greatest ［D］ allround athlete of modern times.
2. “冠词＋表示单概的名词＋介词短语或从句(不管介词短语或从句中的名词是单数名词还是复数名词)”，主句的谓语动词都要用单数形式
4) A typical ［A］ farm in the ［B］ midwestern United States cover ［C］ about three hundred acres of fertile ［D］ prairie land.
5) The Petrified Forest of eastern Arizona are ［A］ made up of tree trunks ［B］ that were buried in mud，sand，or volcanic ash ages ago ［C］ and have turned to stone ［D］ .
6) Many ［A］ of the population in the rural areas ［B］ is composed ［C］ of manual laborers ［D］ .
二、 数词与修饰名词间的呼应
1. 可数名词要么与冠词连用，要么用其复数形式，一般不单独使用
7) Thomas Jefferson skillfully ［A］ organized his ［B］ supporter ［C］ in congress into a strong ［D］ political group.
2. 表示“一”的数词作定语时，用可数名词单数；表示“一”以上的数词作定语时，可数名词用其复数
8) If ［A］ [KＧ2] laid out ［B］ in a straight line，the human digestive tract(消化道) would measure ［C］ approximately thirty foot in length ［D］ .
9) Edna Ferber told ［A］ the story ［B］ of her life ［C］ in two book ［D］ .
10) Sea turtles date back 100 million year ［A］ and are the only ancient ［B］ sea reptiles to survive ［C］ to the present ［D］ day.
3. 序数词作定语时，名词用单数形式。这时序数词前常加定冠词the
11) Sodium(钠) is ［A］ the six ［B］ mo
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