Marie Kondo is an expert（专家）on organizing and cleaning．She is considered an expert on clearing away unused or unnecessary things，known asclutter．She wrote a book called"The Life-Changing Magic of Tidying Up"，which is a best-seller around the world．

Marie Kondo says people can improve their life by changing the way that they think about all their things-everything from books，documents and photographs to clothing．

This is not the first time an organizing expert has written a book on clutter．Other books suggest wonderful things will happen when you organize your home．One book says that if you throw out 50things from your home，you will truly find your life．Another book says that if you make clutter disappear，you will also lose weight．And still others promise a better job，more money and a perfect family if you simply organize the things．Marie Kondo told the Business Insider website that some of her customers have lost weight．"Your self-perception is improved by living in a clean and tidy room，"she said．"This can change lifestyles and appearances．"

Marie Kondo teaches a method of organizing that she calls KonMari．Ms．Kondo says KonMari creates a different relationship between you and your things．If the object meant something to you or served you well，you thank it for its service before throwing or giving it away．In her book，Ms．Kondo suggests that you touch the item and ask one simple question，"Does it bring me joy？"If it doesn't，you give it away so that it may give joy to someone else．

38．What does the underlined word"clutter"in Paragraph1refer to？___

A．Marie Kondo．

B．the best-seller．

C．unused or unnecessary things．

D．expert on organizing and cleaning．

39．The text is especially useful for those who care about___．

A．their body shape

B．their healthy diet

C．their home buying

D．their home environment