根据句意，补全单词中所缺字母，使补全后的句子通顺、合理。

1. What do you m_ _ _by this word, please? 　　

2. I will s _ _ _my friends some pictures as presents. 　　

3. The little boy can't stand w _ _ _ _ _ _his mother's help. 　　

4. "Hands up" is a _ _ _ _ _ _way of saying "Put up your hands". 　　

5. More and more foreigners come and v_ _ _ _ China and more and more Chinese go to foreign countries.

Gigabit Ethernet的传输速率比传统的10Mbps Ethernet快100倍，但是它仍然保留着和传统的 Ethernet的相同的 ______。

A．物理层协议

B．帧格式

C．网卡

D．集线器