The earliest form of artificial lighting was fire, which also provided warm and

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问题 The earliest form of artificial lighting was fire, which also provided warm and protection.

选项 A、hot
B、sunshine
C、warmth
D、safe

答案 C

解析此句意为：人工照明的最早方式就是火，而且火还能提供温暖和保护。所填之处应是一个名词，因此应为选项C。

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