Speaker A.. Are you going to your family reunion this Christmas holiday Speaker B:______

A．As a matter of fact, I don't mind it at all.

B．I do. I've been excited about it for a long time.

C．However, my parents and I are going to take a trip to Hawaii.

D．You bet. All my uncles and aunts will take their children along, too.

胎盘能分泌哪些激素？