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18. According to the passage, the floor of the Black Sea can best be compared to a (A) rapidly moving conveyor belt
(B) slowly settling foundation
(C) rapidly expanding balloon
(D) violently erupting volcano
(E) slowly eroding mountain
这道题的正确答案是B 答案从最后一段找:
These seas have a typical oceanic floor, except that the floor is overlaid by several kilometers of sediment. Their floors have probably been sinking for long periods. It seems possible that a sinking current of cooled mantle material on the upper side of the plate might be the cause of such deep basins.
我选错了E 不知道有没有人可以解释一下E为什么不对?既然说了是 overlaid sediment, 为什么不是指代山呢?谢谢!
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