题目

You know how wonderful you are, and you know that others know how wonderful you are, but what do you do when admiration crosses over the line into jealousy(嫉妒)? For most teens there will come a day when you realize that one of your friends is jealous and that this jealousy is hurting your friendship. When this happens it can seem like there is nothing that you can do, but the good news is that there is. Don’t let jealousy spoil your relationships. Handle it head on and you might be back to normal much sooner than you think. It can be hard to walk up to a friend and ask them what 唐朝的城市中既是当时各族交往的中心，又是国际性大都市的是：（  ） A．洛阳　　 B．长安 C．扬州　 D．成都