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Lesson 9 模拟通话小测 根据旁白发话Callsign is BAW725-9
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A computer system consists of two main elements: ( ).
The peripherals of the computer can be classified into two groups: ( ).
Users can type in text and commands using the ( ), which is one of the most important input devices.
The most useful pointing device is a ( ), which allows the user to point to elements on the screen.
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