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【题目】__________ (explore) of the solar system began in the 19th century.

【答案】Exploration

【解析】

句意:对太阳系的探索始于19世纪。

考查名词。此处有介词of,可知需要填写名词。根据所给词explore动词,探索,名词形式为exploration。根据句意可知此处表示“对太阳系的探索”。此处注意大写首字母。故填Exploration

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