题目

   After a long, harsh(严酷的)winter, it is time to clean your house thoroughly. When it comes to spring-cleaning, you can try green spring-cleaning instead of using harsh chemicals, of course. ___36____Here are several tips that can help you achieve your spring-cleaning goal.    The first thing you should do is to open windows to provide good air circulation throughout the house. ___37___For the task of removing dust, it is best to use a soft cloth to remove the dust rather than other things like a feather dustier which tends to spread it around. If you must use a cleaner of [2014·湖南六校联考]设x1，x2是方程ln|x－2|＝m(m为实数)的两根，则x1＋x2的值为(　　)A．4B．2C．－4 D．与m有关