问题
选择题
People have always been_______ about exactly how life on earth began.
A．curious
B．excited
C．anxious
D．careful
答案
答案：A
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。