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【单选题】
一块石头被石匠修整后，曝露于自然环境中时，一层泥土和其他矿物质便逐渐开始在刚修整过的石头表面聚集。这层泥土和矿物质被称作岩石覆盖层。在一块安第斯纪念碑的石头的覆盖层下面，发现了被埋藏一千多年的有机物质。因为那些有机物质肯定是在石头被修理后不久就生长到它上面的，也就是说，那个纪念碑是在1492年欧洲人到达美洲之前很早就建造的。下面哪一点如果正确，能够最严重地削弱上面的论述?A.
岩石覆盖层自身就含有有机物质。
B.
在安第斯，1492年前后重新使用古人修理过的石头的现象非常普遍。
C.
安第斯纪念碑与在西亚古代遗址上发现的纪念碑极为相似。
D.
最早的关于安第斯纪念碑的书面资料始于1778年。
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She wasn't quite ready to come back to campus.
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There are more endangered species in zoos than in the wild.
C.
The birds won't learn to keep away from people.
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She might change her major.
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