问题
单项选择题
采用点，点线路的通信子网的基本拓扑构型有4种，它们是
A．星型、树型、网状型和全互联型
B．星型、环型、总线型和树型
C．总线型、星型、树型和网状型
D．星型、环型、总线型和网状型
答案
参考答案：A
解析： 采用点—点线路的通信子网的基本拓扑结构有星型、树型、网状型和环型。
搜题请搜索小程序“爱下问搜题”
采用点，点线路的通信子网的基本拓扑构型有4种，它们是
A．星型、树型、网状型和全互联型
B．星型、环型、总线型和树型
C．总线型、星型、树型和网状型
D．星型、环型、总线型和网状型
参考答案：A
解析： 采用点—点线路的通信子网的基本拓扑结构有星型、树型、网状型和环型。
| Reading comprehension. | ||||||||||||||||||||||||
| Mary and Tom go to the West City Supermarket to do some shopping. Here are the prices of the things in the supermarket and their shopping lists.
bananas Tom's shopping list: 1 box of butter (Australia); 1kg of steak (Australia); 3 apples (Canada); 2kg of bananas (Thailand) (泰国) | ||||||||||||||||||||||||
| 1. At first Mary wants to buy the things from China. She can only buy ______ from this supermarket. | ||||||||||||||||||||||||
[ ] | ||||||||||||||||||||||||
| A. rice, apples and butter B. milk, bananas and steak C. apples, bananas and milk | ||||||||||||||||||||||||
| 2. From the passage we know Mary buys from Australia. | ||||||||||||||||||||||||
[ ] | ||||||||||||||||||||||||
| A. apples; rice and butter B. rice, butter and steak C. butter, steak and apples | ||||||||||||||||||||||||
| 3. How much does Mary pay for the things from China and Australia? | ||||||||||||||||||||||||
[ ] | ||||||||||||||||||||||||
| A. ￥105. B. ￥145. C. ￥135. | ||||||||||||||||||||||||
| 4. How much does Tom pay for the things? | ||||||||||||||||||||||||
[ ] | ||||||||||||||||||||||||
| A. ￥88. B. ￥80. C. ￥87. | ||||||||||||||||||||||||
| 5. Which of the following is NOT true? | ||||||||||||||||||||||||
[ ] | ||||||||||||||||||||||||
| A. Rice and banana from Thailand are the cheapest. B. The prices of the things from Japan are the highest. C. Tom and Mary bought the same kinds of fruit in the supermarket. |