【简答题】Online shopping is growing fast in China, and more and more Chinese are buying books online. At the same time, traditional bookstores are facing new challenges. A bookstore in Beijing is going out of ...
【单选题】A 68-year-old man is admitted to the hospital due to severe back pain. Radiologic examination reveals severe osteoporosis of the vertebral column, with compression fractures to vertebrae L4 and L5. Wh...