单项选择题 天然大理石按质量分为（）。

单项选择题 听力原文：M: I have been studying too much and need a change. So I have just made plans to go away during January break.W: Really? Where are you going?M: I'm planning to visit New Mexico.W: My sister and I had the vacation there last year and we had a great time.M: Did you get into Albuquerque?W: Sure. Whenever we went skating.M: Is it far from the mountains?W: Not at all. Even though Albuquerque is on a high flat plateau, there are even higher mountains near it. Just half an hour away from the city there is a snow-covered slope.M: Well. As the mountains are just thirty minutes away, I guess I should take my ice skate and my skis.W: Definitely.M: I heard that the weather there was great.W: It is 'No humidity' but with moderate temperatures, but you do need to be careful about high altitude.M: What should I do about that?W: Oh, just take it easy for a few days. Don't go hiking up the mountains or exercise too vigorously. Just do everything gradually.M: I'm sure I will be fine. And I will let you know all about my trip when I come back.What is the main purpose of the man's trip?A．To improve his skating techniques.B．To climb mountains.C．To take a vacation.D．To learn to ski.

单项选择题 国外的金融服务业的标准客户细分方法一般是:顶端客户(1%)、高端客户(4%)、中端客户(25%)以及低端客户(70%)。( )