Scientists have dated sharp-edged flakes of store found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years agao, pushing back by more than 150,000 years the earliest date when it is known that humans made store tools.
A When it is known that humans made B at which it is know that humans had made C at which humans are know to be making D that humans are known to be making E of humans who were known to make
答案给的是E。实在是想不出来，请各位NN帮忙解答。。。。 作者: James 时间: 2010-3-9 15:36
这个题目每个选项都有错
建议LZ忽略它
我认为是题目本身少写了一些词汇导致最后没有答案
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