Experts say that changing from a seated to a standing desk can improve productivity.Similar desks have become a common sight at tech firms such as Google，where some employees have even installed treadmill(跑步机)and bicycle desks.

　　The desk is not the first“convertible” on the market.As early as 2017，Stir Kinect brought out an adjustable desk.The $3,890 Stir Kinect desk has a motor to raise and lower itself，converting it into a standing desk or a traditional desk.The desk can even be programmed to move up and down slightly，making it appear to take a gentle breath to remind the users to change their positions.To move between sitting and standing positions，owners simply double tap on the screen.The desk can learn the user's preferences and suggest the best seating position.

　　The Stir Kinect desk was created by a team of ex­Apple and Disney engineers.It has a built­in touch screen to control and track movement，and can tell users exactly how many calories they burn by standing during their working days.It also has devices containing power points and USB ports for charging phones，to keep cables hidden.

　　“Ikea's height­adjustable desk is great for opening up the lower end of the market，”said JP Labrosse，founder and CEO of Stir Kinect.

　　1．What is the text mainly about?

　　A．Ikea has brought out an adjustable standing desk.

　　B．Silicon Valley offered health benefits to officials.

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