Cleaning Your Mouse and Scroll Ball

　　Use a cloth that’s been lightly moistened (湿) with water to clean. Don’t get moisture in any openings. If your mouse stops scrolling or if scrolling becomes rough, clean the mouse scroll ball. Turn the ball while cleaning for complete coverage.

　　56．You have to

　　before setting up the mouse.

　　A．turn the scroll ball slightly

　　B．clean the mouse with a cloth

　　C．check the software in the mouse

　　D．connect the mouse and the computer

　　57．What can we learn about the wireless mighty mouse?

　　A．Its scroll wheel can move in all directions.

　　B．Different buttons have different functions.

　　C．Side buttons are more useful than left and right buttons.

　　D．Only the right button can display an icon’s short – cut menu.

　　58．The passage is probably taken from a (an)

　　.

　　A．textbook

　　B．instruction

　　C．research report

　　D．scientific essay

　　B

　　While I was in 9 th grade, I built a circuit (电路装置) for the traffic system of our city. After getting the first prize. I got this valuable advice from my father; “Do whatever interests you, and don’t let the work challenge you, make sure you are challenging that work.”

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