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  3. The first two stages in the development of civilized man were probably the invention of primitive weapons and the discovery of f

The first two stages in the development of civilized man were probably the invention of primitive weapons and the discovery of f

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问题     The first two stages in the development of civilized man were probably the invention of primitive weapons and the discovery of fire, although nobody knows exactly when he acquired the use of the latter.
    The origin of language is also obscure. No doubt it began very gradually. Animals have a few cries that serve as signals, but even the highest apes have not been found able to pronounce words, even with the most intensive professional instruction. The superior brain of man is apparently a necessity for the mastering of speech. When man became sufficiently intelligent, we must suppose that he gradually increased the number of cries for different purposes. It was a great day when he discovered that speech could be used for narrative. There are those who think in this respect picture language preceded oral language. A man could draw a picture on the wall of his cave to show in which direction he had gone, or what prey he hoped to catch. Probably picture language and oral language developed side by side. I am inclined to think that language has been the most important single factor in the development of man.
    Two important stages came not so long before the dawn of written history. The first was the domestication of animals; the second was agriculture. Agriculture made possible an immense increase in the number of the human species in the regions where it could be successfully practiced. Another fundamental technical advance was writing, which, like spoken language, developed out of pictures, but as soon as it had reached a certain stage, it was possible to keep records and transmit information to people who were not present when the information was given.
    These inventions and discoveries-- fire, speech, weapons, domestic animals, agriculture, and writing —made the existence of civilized communities possible. From about 3 000 BC until the beginning of the Industrial Revolution less than two hundred years ago there was no technical advance comparable to these. During this long period man had time to become accustomed to his technique, and to develop the beliefs and political organizations appropriate to it. There was, of course, an immense extension in the area of civilized life. There was no technical progress during this long time --there were even two inventions of very great importance, namely gunpowder and the mariner’s compass   but neither of these can be compared in their power to such things as speech and writing and agriculture.
In the 3rd paragraph, "... in the regions where it could be practiced... ", here, "it" refers to ______.
选项 A、increase
B、number
C、agriculture
D、species
答案C
解析 在第三段第四句“Agriculture made possible an immense increase in the number of the human species in the regions where it could be successfully practiced．”所以容易看出在where it could be successfully practiced 的定语从句里，practice就是实践的意思，所以它和agriculture 构成一对动宾词组的关系，所以本题选C agriculture。
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