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1. Scientists have dated sharp-edged flakes of stonefound in the fine-grained sediments of a dry riverbed in the Afar region ofEthiopia to between 2.52 and 2.60 million years ago, pushing back by more than150,000 years the earliest date when it is known that humans made stonetools. A. whenit is known that humans made B. atwhich it is known that humans had made C. atwhich humans are known to have made D. thathumans are known to be making E. ofhumans who were known to make 这题选c， 我选了a。。划线部分这种结构根本就没搞懂过。。把它还原成正常语序应该是怎样的？“ humans are known to have made stone tools at which date?" 那那个 pushing back by more than 150,000 years又该放哪里呢？ 感觉完全没看懂啊。。
2. Five hundred million different species ofliving creatures have appeared on Earth, nearly 99 percent of them vanishing. A. Five hundred million differentspecies of living creatures have appeared on Earth, nearly 99 percent of themvanishing. B. Nearly 99 percent of fivehundred million different species of living creatures that appeared on Earthhave vanished. C. Vanished are nearly 99percentof the five hundred million different species of living creatures that appearedon Earth. D. Of five hundred milliondifferent species of living creatures that have appeared on Earth, nearly 99percent of them have vanished. E. Of the five hundred milliondifferent species of living creatures that have appeared on Earth, nearly 99percent have vanished. 这题选e，我选了b。。 出去b中apperared用过去时时态不对外，还有别的错误吗？ 这里的这个定冠词the是一定必须的吗？？
求大虾们看进来！！！～
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发表于 2013-8-20 12:58:55
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