People have always been ______ about exactly how life on earth began.

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问题 People have always been ______ about exactly how life on earth began.

选项 A、curious
B、excited
C、anxious
D、careful

答案A

解析 curious表示“好奇的”;excited表示“兴奋的”;anxious表示“焦虑的”: careful表示“小心的”。由词义可知A项最符合题意,be curious about表示“对……好奇”。
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