The theory that the 1908 Tunguska event was the explosion of a cosmic body in the sky over Siberia is________: no one has yet fo

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问题 The theory that the 1908 Tunguska event was the explosion of a cosmic body in the sky over Siberia is________: no one has yet found fragments of the object or any impact craters in the affected region.

选项 A、long-standing
B、indisputable
C、plausible
D、uncontested
E、unproven

答案E

解析逻辑连接标志是冒号，表示前后同义重复。前面说Tunguska事件是一个从西伯利亚上空飞过的宇宙天体的爆炸的理论是________的，冒号后面说没有人在受影响的区域发现天体的碎片或者任何撞击的弹坑(no one has yet found)。既然目前没有人发现碎片或弹坑，就是说这个理论缺乏证据，因此空格表达“没有证据”的含义，选项符合预期的是E项unproven(未经证实的)。

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