单选题:根据以下材料,回答题。Why does the author mention "pyramid builders"? A

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根据以下材料,回答题。

Why does the author mention "pyramid builders"?
A. Because they once worked miracles.
B. Because they were well-built.      
C. Because they were actually very weak.
D. Because even they were unable to rescue their civilization.
参考答案:
答案解析:

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由于常规的抗生素的使用可以产生能在抗生素环境下存活的抗生菌,人体内存在抗生菌是由于人们使用处方抗生素,但是一些科学家相信人体内大多数抗生菌是由人们吃下的已经被细

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These factors interact intimately and cannot be separated.A.tensely B.nearly C.c

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