问题
填空题
在Uu口上，协议栈按其功能和任务，被分为（）；（）和网络层等3层。
答案
参考答案：物理层、链路层
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在Uu口上，协议栈按其功能和任务，被分为（）；（）和网络层等3层。
参考答案：物理层、链路层
| 请用方框中词语的适当形式完成句子. | |
2. I don't like _________ subjects. I only like playing with my dog. 3. My teacher is as _________ as a bee(蜜蜂). He works day and night. 4. Tommy likes _________ because it's interesting. 5. I look _________ for my dog, Dick, but I can't find him. |