People have always been_______ about exactly how life on earth began.
A．curiousB．excitedC．a(chǎn)nxiousD．careful
A
考查形容詞短語(yǔ)。Be curious about對(duì)…好奇；be excited about對(duì)…興奮；be anxious about對(duì)…焦慮；be careful about對(duì)…細(xì)心；結(jié)合句意可知A正確。句意：人們總是對(duì)生命究竟是如何開始的充滿好奇。
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