巴比妥类药物与银盐反应的特点为，首先生成_____________一银盐，继而生成_____________二银盐。
参考答案：可溶性、不溶性
一个数除以32，商是6，余数是23，求这个数。
Two American couples each ___ a Chinese girl and they happen to be twin sisters.
A．have adapted
B．has brought up
C．has received
D．have adopted
