单选题：The ice cream cone，the hamburger，and iced tea were all intro

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题目内容：

The ice cream cone，the hamburger，and iced tea were all introduced at the 1904 Louisiana Purchase Exposition informally known as the St. Louis Fair. A．previously
B．unofficially
C．incorrectly
D．occasionally

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根据以上选项，回答题Scientists ignored Lake Vida because they thought

根据以上选项，回答题Scientists ignored Lake Vida because they thought that a lake of ice__

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The underlined word "significant" in paragraph 3 most probab

The underlined word "significant" in paragraph 3 most probably means __________．

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根据以下材料回答题：请在（67）处填上最佳答案。

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The explorer approached the troop of gorillas warily.

The explorer approached the troop of gorillas warily.A．A fearlessly B．B silently

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