产生克隆羊多莉的融合细胞的细胞核来自于[ ]
A．乳腺细胞
B．神经细胞
C．生殖细胞
D．其它细胞
答案：A
— The boss said we had only three days to finish the work.
— Don't worry.We have already________two thirds of it. [ ]
A. got down
B. got through
C. given in
D. given away
IEEE802.3的物理层协议10BASE-T规定从网卡到集线器的最大距离是( )。
A．100m B．185m C．500m D．850m
