单选题：The arch was used by the early cultures of the Mediterranea

  • 题目分类：英语六级
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题目内容：
The arch was used by the early cultures of the Mediterranean area chiefly for underground drains, but it was the Romans who first developed and used the arch extensively in aboveground structures．
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The phrase "a great opportunity" mentioned in the last para

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People have been researching about the electrical phenomena

People have been researching about the electrical phenomena since an early peri

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The lives of teens are depicted as the following EXCEPT

The lives of teens are depicted as the following EXCEPT A．they like to imitate

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