Directions: There are four passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A., B., C. and D. You should decide on the best choice and mark the corresponding letter on the Answer Sheet.
Passage Three
Man’s first real invention, and one of the most important inventions in history, was the wheel. All transportation and every machine in the world depend on it.
The wheel is the simplest yet perhaps the most remarkable of all inventions, because there are no wheels in nature— no living thing was ever created with wheels. How, then, did man come to invent the wheel?
Perhaps some early hunters found that they could roll the dead body of a heavy animal through the forest on logs more easily than they could carry it. However, the logs themselves weighed a lot.
It must have taken a great prehistoric thinker to imagine two thin slices of log connected at their centers by a strong stick. This would roll along just as the logs did yet be much lighter and easier to handle. Thus the wheel and axle came into being, and with them the first carts.
单选题
The wheel is important because _____.
【正确答案】
D
【答案解析】根据第一段第二句“All transportation and every machine in the world depend on it”可知， 轮子的重要性在于所有交通方式和机器都依赖于它。 因此本题答案为D。
单选题
The wheel is described as _____.
【正确答案】
A
【答案解析】根据第二段首句“The wheel is the simplest yet perhaps the most remarkable of all inventions”， 可知轮子的特性之一是其构造非常简单， 因此A为正确选项。
单选题
It was remarkable of man to invent the wheel because _____.
【正确答案】
C
【答案解析】根据第二段“The wheel is the simplest yet perhaps the most remarkable of all inventions, because there are no wheels in nature—no living thing was ever created with wheels”可知， 轮子的发明如此不同凡响的原因是， 在此之前自然界没有轮子存在， 因此C为正确答案。
单选题
This passage says that the first wheel might have been a _____
【正确答案】
D
【答案解析】结合第四段第一句中“It must have taken a great prehistoric thinker to imagine two thin slices of log connected at their centers by a strong stick”可知最早形式的轮子可能是圆木切片。 因此D为正确选项。
单选题
The idea of making wheels might have come from _____.
【正确答案】
D
【答案解析】根据文章第三段第一句“Perhaps some early hunters found that they could roll the dead body of a heavy animal through the forest on logs more easily than they could carry it”可知， 人们关于轮子的设想最早可能来自打猎后猎物尸体滚回驻地的经历， 故D为正确选项。