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  3. Man’s first real invention, and one of the most important inventions in history, was the wheel. All transportation and every mac

Man’s first real invention, and one of the most important inventions in history, was the wheel. All transportation and every mac

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问题     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 carcass 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 string 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.
The wheel is called______.
选项 A、simple
B、complicated
C、strange
D、unusual
答案D
解析 参考文章第一段，其中说到，“轮子在自然界中是不存在的”，所以最能说明轮子的就是“unusual”。
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