下列选项中，（ ）是《中华人民共和国消费者权益保护法》中所规定的经营者的义务
A. 听取消费者对其提供的商品或服务的意见
B. 提供商品或服务应当明码标价
C. 消费者可以自收到商品之日起7日内退货
D. 以上都是
The four basic units of simplified computer: the input unit, central processing unit, memory unit, and output unit.
The central processing unit (CPU) is the heart of the computer system. It is responsible for performing all arithmetic operations and logic decisions initiated by the program.
The memory unit of the computer is used to store information such as numbers, names, and addresses.In computer system, memory is divided into two different sections, known as main storage and auxiliary storage. They are also sometimes called internal memory and external memory respectively.
The input and output units are the means by which the CPU communicates with the outside world.The input unit is used to input information and commands to the CPU for processing.After processing, the information that results must be output.This output of data from the system is performed under control of the output unit.
Based on the paragraph above,( ) is the most important unit of the computer system, memory is regarded as ( )disparate kinds,（ ） connects computer and human.
第 1 问
A. input unit
B. central processing unit
C. memory unit
D. output unit
第 2 问
A. one
B. two
C. three
D. four
第 3 问
A. screen
B. central processing unit
C. memory unit
D. I/O unit
下列关于职业道德基本范畴的相关说法错误的是（）
A. 职业荣誉可用以评价各种职业的社会价值
B. 职业信誉包含职业荣誉和职业名誉两方面的含义
C. 职业尊严能最大程度地激发从业人员的自豪感
D. 职业信誉体现出社会承认一个行业过去职业活动的价值，也影响着本行业在以后活动中的地位和作用