题目

There are many places on the earth that are still ________ (known) to humans. 答案: unknown 【详解】 句意:地球上还有许多人类未知的地方。根据主句 “There are many places on the earth” 可知,应是人类未知的; known ,知道的,形容词,反义词为 unknown ,未知的,形容词,作表语。故填 unknown 。
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