试题题干
Directions: Read each of the following sentences carefully, and choose A,B,C or D that has the closest meaning to the underlined word or phrase.
Through the passing millennia, thousands of animal species have come and gone.（）
参考答案
正确答案：
试题解析
come into existence and become extinct，形成又灭亡。千百年来，数以千计的动物物种来了又去。