细胞中蛋白质的合成都是起始于细胞质基质中，合成开始后，有些转至内质网上继续合成。（）
参考答案：对
--- A homeless man won a lottery ticket. He became rich over night.
--- ___________________
A．Better safe than sorry.
B．The early bird catches the worm.
C．Too many cooks spoil the broth.
D．Every dog has its day.
IP协议寻址方式支持A、B、C、D、E5种网络类型，IP地址193.200.100.2的网络类型为（）
A.A类
B.B类
C.C类
D.D类
