问题
单项选择题
802.1q协议是在原数据帧中插入的标签占多少字节？（）
A.2
B.4
C.6
D.8
答案
参考答案：B
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802.1q协议是在原数据帧中插入的标签占多少字节？（）
A.2
B.4
C.6
D.8
参考答案：B
| 阅读理解。 |
| Tom and Ann have a dog and a cat. The dog is Tom's. It's black. Its name is Peter. The cat is Ann's. Its name is Gunder. Tom and Ann are playing with their dog and cat in the room. They put two boxes there. They want to let the dog and cat jump up on the boxes. "Jump!" Tom says to the dog."Jump, Peter!" But Peter doesn't jump. It runs in the room and jumps in (扑到……怀里)Tom. Ann puts the cat on a box."Stay there. Gunder!" Ann says. But Gunder jumps down and goes away. "It's not easy." Tom says. "No, it isn't." Ann says. |
| 1. What do Tom and Ann have? |
[ ] |
| A. Tom has a dog. Ann has a rat. B. Tom has a cat. Ann has a dog. C. Tom has a dog. Ann has a cat. D. Tom has a box. Ann has a house. |
| 2. — What colour is the dog? — It's _____. |
[ ] |
| A. white B. black C. blue D. yellow |
| 3. — Where are they playing with their dog and cat? — They are playing ______. |
[ ] |
| A. in the room B. on the ground C. in the park D. outside their house |
| 4. — What do they want the dog and cat to do? — They want them ______. |
[ ] |
| A. to play each other B. to jump up on the boxes C. play with them D. jump down and go away |
| 5. Can they do it? |
[ ] |
| A. Yes, it is easy. B. Yes, it isn't difficult. C. No, it is easy. D. No, it is hard. |