新物种形成最显著的标志是（）
A.具有一定的形态结构
B.改变了基因频率
C.产生了地理隔离
D.产生了生殖隔离
参考答案：D
自适应量化
Talks on climate change resumed in the German city of Bonn on July 16 to combat global warming.
A．focus on
B．settle down
C．fight against
D．sum up
