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  3. Scientists had thought people began manipulating fire to create tools in Europe about 25, 000 years ago. But the new finds sugge

Scientists had thought people began manipulating fire to create tools in Europe about 25, 000 years ago. But the new finds sugge

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问题     Scientists had thought people began manipulating fire to create tools in Europe about 25, 000 years ago. But the new finds suggest that people in【C1】______is now South Africa discovered that heating a stone called silcrete would make it easier to flake, allowing them to shape more 【C2】______ blades, knives, and other tools. These early engineers likely used some of these tools to hunt and butcher wide range of【C3】______, from the aggressive buffalo to the tiny rat.
    This sophisticated control【C4】______ fire reflects advanced smarts, and marks the turning point【C5】______we became " uniquely human," said study leader Kyle Brown, an archaeologist at the University of Cape Town. "These people were extremely【C6】______," Brown said. "These are not the【C7】______of the classic cavemen. "
    As part of the study, the researchers 【C8】______ the processes the early Africans likely【C9】______ to make the stone tools. Heated over a fire pit, the silcrete flaked and【C10】______a glossy red color.
    Such craftsmanship required thinking 【C11】______, a sign of high intelligence, Brown said. People had to【C12】______ firewood, build the fire, work the stone, and then【C13】______the handle to the stone using natural adhesives. " Because(this is)such a sophisticated technology, this is something that would【C14】______ language to【C15】______ to the next generation," he added.
    But paleoanthropologist John Shea isn’t convinced by the idea that " heat treating" stone was a sign of the 【C16】______to modern human behavior. " My position is that you shouldn’t 【C17】______ this event—you have to prove it," Shea said.【C18】______, Shea praised the study, saying it will 【C19】______ people to seek out other heat-treated stone tools【C20】______ in the African record.
【C2】
选项 A、advanced
B、primitive
C、rough
D、simple
答案A
解析 形容词辨析题。句意为：……加热这种石头，会很容易使它变成薄片，这使得人类能够加工更加高级的刀刃或其他工具。显然人类的这个发现使得自身制造工具的本领得以提高，从而制造出来的工具也更进步，故选择[A]advanced。primitive“原始的”；rough“粗糙的”；simple“简单的”。
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