解析:推理判断题。从第一、二段的may provide important clues to a mysterious period in North American prehistory...when humans gradually shifted from hunting large animals to fishing,gathering and agriculture可知B项正确。
答案:B
4.According to the passage,________.
A.experts haven’t found out the age of the wood
B.experts first noticed the wood when they were diving
C.the wood was probably a humanmade tool
D.the wood is the most important discovery among all the samples found under the lake
解析:推理判断题。从第五段的It must have been created.It looks like it might have been used as a tent pole or a pole to hang meat.可知C项正确。
答案:C
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