【单选题】Sprained(扭伤)Ankle One ofthe most common injuries teenagers and adults experience is a sprained ankle. Asprain oc-curs when the ligaments(韧带)of a joint are twisted(扭伤) and possibly torn.Ligaments are b...
【简答题】A.It is the most common sleeping problem that people are suffering from. B.About 8 to 10 percent of population have this problem. C.During sleep bruxism, a person’s teeth make contact for 40 min...