【題目】Almost every machine with moving parts has wheels, yet no one knows exactly when the first wheel was invented or what it was used for. We do know, however, that they existed over 5,500 years ago in ancient Asia.

The oldest known transport wheel was discovered in 2002 in Slovenia. It is over 5,100 years old. Evidence suggests that wheels for transport didn't become popular for a while, though. This could be because animals did a perfectly good job of carrying farming tools and humans around.

But it could also be because of a difficult situation. While wheels need to roll on smooth surfaces（光滑表面）, roads with smooth surfaces weren't going to be built until there was plenty of demand for them. Finally, road surfaces did become smoother, but this difficult situation appeared again a few centuries later. There had been no important changes in wheel and vehicle design before the arrival of moden road design.

In the mid-1700s, a Frenchman came up with a new design of road—a base layer (層) of large stones covered with a thin layer of smaller stones. A Scotsman improved on this design in the 1820s and a strong, lasting road surface became a reality. At around the same lime, metal hubs (the central part of a wheel) came into being, followed by the pneumatic tyre(充氣輪胎) in 1846. Alloy(合金) wheels were invented in 1967, sixty years after the appearance of tarmacked roads (柏油路). As wheel design took off, vehicles got faster and faster.

【1】 What might explain why transport wheels didn't become popular for some time?

A. Few knew how to use transport wheels.

B. Humans carried farming tools just as well.

C. Animals were a good means of transport.

D. The existence（存在）of transport wheels was not known.

【2】How is the last paragraph mainly developed?

A. By giving examples.

B. By making comparisons.

C. By giving discussion

D. By making classifications.(分類)

【3】What is the passage mainly about?

A. The beginning of road design.

B. The development of transport wheels.

C. The history of public transport.

D. His invention of fast-moving vehicles.

【答案】

【1】C

【2】A

【3】B

【解析】

試題分析：本文是一篇說明文，全文講述了車輪的發(fā)展歷程以及道路設(shè)計對車輪發(fā)展的影響。

【1】C推理判斷題。難度：中等。根據(jù)第二段This could be because animals did a perfectly good job of carrying farming tools and humans around.（這或許是因為動物在拉運(yùn)農(nóng)具人們的方面做得不錯。）可知由于當(dāng)時動物使用的方便讓輪子沒能夠普及。故C正確。

【2】A 寫作手法題。根據(jù)最后一段a Frenchman came up with a new design、A Scotsman improved on this design 、Alloy(合金) wheels were invented in 1967都是在舉例說明車輪的發(fā)展歷程，并沒有比較、分類和解析討論。故A正確。

【3】B 主旨大意題。本文第一句Almost every machine with moving parts has wheels, yet no one knows exactly when the first wheel was invented or what it was used for.介紹了車輪的重要作用，接下來各段中詳細(xì)介紹了車輪的發(fā)展歷史以及道路設(shè)計對車輪發(fā)展的影響。故B正確。

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