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单选题
The reference to pieces of debris in Passage 1 (line 3) is used to ______.
A
highlight the potential uses of stone implement
B
contrast this early innovation with those of later generations
C
suggest that these devices are man's greatest achievement
D
emphasize the significance of the creation of these tools
E
imply that these tools were made from inferior materials
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参考解析
解析：
文中提到“pieces of debris were deliberately reworked into tools”，接着提到工具的创造是人类进化的一个转折点，故选D项，是为了强调工具的创造的重大影响。
文中提到“pieces of debris were deliberately reworked into tools”，接着提到工具的创造是人类进化的一个转折点，故选D项，是为了强调工具的创造的重大影响。
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