题目

新物种形成的必要条件是                                          (    )   (A)具有一定的形态结构和生理功能  (B)产生了地理隔离   (C)形成了生殖隔离                               (D)改变了基因频率   答案：CJohnson King is a fine musician; it’s a ______ to hear him play. A．privilege          B．consequence       C．acquaintance       D．convenience