成纤维细胞分泌的哪些物质组成毛细血管基底膜的网板（）。
A.层粘连蛋白
B.纤维连接蛋白
C.Ⅲ型胶原
D.Ⅳ型胶原
E.基质
参考答案：A, B, D
---I’ll try harder next time.
---You have said it one hundred times. But _____.
A．the early bird catches the worm
B．a friend in need is a friend indeed
C．you can’t burn the candle at both ends.
D．actions speak louder than words
They are ______ profiles. [ ]
A. Millie and Danil's
B. Millie's and Danil's
C. Millie's and Danil
D. Mille and Danil
