People have always been_______ about exa...

People have always been_______ about exactly how life on earth began.

A．curious

B．excited

C．anxious

D．careful

A 【解析】考查形容词短语。Be curious about对…好奇；be excited about对…兴奋；be anxious about对…焦虑；be careful about对…细心；结合句意可知A正确。句意：人们总是对生命究竟是如何开始的充满好奇。

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