单选题
About 150 years ago the children of a poor farmer who lived in South Africa found a pretty pebble (鹅卵石) on the bank of a river. The pebble shone brightly in spots. The children took the pebble home and showed it to their mother. Then they tossed (扔) it aside. The next day a neighbour saw it and offered to buy it. The children and the mother told him that he could have it for nothing. Who ever heard of selling a pebble? The pebble turned out to be a large diamond. No one had known that there are diamonds in South Africa. Today a large part of all the diamonds in the world come from a region not far from the place where the children found their bright pebble. Diamonds are crystals of carbon. Carbon is a very common material. Coal, for example, is made up mostly of carbon. But the carbon of coal is not in crystal form. Clear crystals of carbon are very rare. The word "diamond" comes from a Greek word meaning "the unconquerable". The diamond got its name because of its hardness. No other material is so bard. It is used in tools for cutting and drilling into very hard substances. Some saws, for example, have tiny diamonds set in the teeth.
单选题
The children and their mother gave the pebble to their neighbour and asked nothing for it because ______. A. they were good neighbours B. they didn't need money C. they thought it silly to sell a pebble D. they didn't know it was a diamond
单选题
For a long time, people didn't know that ______. A. there were diamonds in South Africa B. a diamond was the hardest of all substances C. "diamond" was originally a Greek word D. diamonds were crystals of carbon
【正确答案】
A
【答案解析】[解析] 细节推断题。由第二段的第二句可以推断出答案。
单选题
The original meaning of the word "diamond" in Greek suggests ______. A. Rareness B. hardness C. crystal form D. bright spots