托福TPO39阅读passage1答案解析（Origins of the Megaliths）
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1 Since the days of the earliest antiquarians, scholars have been puzzled by the many Neolithic (~4000 B.C.~2200 B.C.) communal tombs known as megaliths along Europe's Atlantic seaboard. Although considerable variations are found in the architectural form of these impressive monuments, there is a general overriding similarity in design and, particularly, in the use of massive stones.