need for agricultural advances to help feed a growing population.
b.The development of safer machines demanded by the labor movement.
c.Machinery that contributed to the agricultural revolution.
d.New Jersey as a leader in the agricultural revolution.
答答案： c
解析： 本文围绕农业革命和机器进行了论述。
2. The expression "make the most of" in Line 4is closest in meaning to which of the following?
a.get the best yield from b.raise the price of c.make full use of d.earn a living on
答案： c
解析： make the mast of意思是“充分利用”，意同“make full use of”。
3. Which of the following can be inferred from what Thomas Jefferson said?
a.Europe was changing more quickly than America.
b.Europe had greater need of farm machinery than America did.
c.America was finally rnning out of good farmland.
d.There was a shortage of workers on American farm.
答案： d
解析： 第一段最后一句提到在美国首先出现了先进的农业机器。前一句说土地多的地方要充分利用劳动力，说明美国相对来说“劳动力不足，土地富裕”。
4. It can be inferred that the waord"here"in Line 4 refers to_____.
a.Europe b.America c.New Jersey d.Indiana
答案： b
解析： “In Europe”，said Thomas Jefferson，“the object is to make the most of their land,labor being abundant;here it is to make the most of our labor,land being abundant.”It was in America,therefore,that the great advances in 19th century agricultural machinery first came.从黑体部分可以清楚看出here指代“美国”。here与in Europe构成对比句子结构。
5. What point is the autor making by stating that farmers could carry nearly all their tools on their backs?
a.Farmers had few tools before the agricultural revolution
b.Americans were traditionally self-reliant.
c.Life on the farm was extremely difficult.
d.New tools were designed to be portable.
答案： a
解析： 起初农民几乎可以背得了所有的工具，说明那时候工具又少又简单，与后来的大机器形成对比。
Passages 2.
There are many problems connected with space travel.The first and greatest of themis gravity.If you let your pencil drop to the floor,you can see gravity in action.Everything is held down to the earth by magnetic force.A rocket must go at least 2,500miles an hour to take anyone beyond the gravity of the earth into space.
Another problem is the strain(作用力) that a person is subjected to when a rocket leaves the ground.Anything that is not moving tends to resist movement.As the rocket leaves the ground,it pushes upward violently,and the person in the onse cone(驾驶舱) is pushed back against the chair.During this thrust,gravity exerts a force on the body equal to nine times its normal force.
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