题目

阅读短文，并按照要求完成56—60题。There are many great works of art in museums, including some priceless pieces that can never be replaced. When we get a chance to enjoy them, we need to respect the art and other visitors. Here are several rules we should follow in museums.Respect the space• Keep the museum space clean and throw away all rubbish.• Remember that large things are not allowed in museums. But we can put our coats? bags，backpacks, umbrellas, etc, into the storage (储物柜) near the entrance,• No eating or drinking is allowed inside museums, Finish all food 用一架已调节好平衡的天平称量物体，由于砝码的使用时间过长，已经有点磨损，用这架天平称量物体的质量将( )A.偏小B.正好相等C.偏大D.随称量物体改变