A、The low humidity. B、The changing climate. C、The high altitude. D、The extreme temperatures. C

M: I have been studying too much and need a change. So I’m just making 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 were skating.
M: Is it far from the mountains?
W: Not at all. There is even though Albuquerque on the high plateaus. There are even higher mountains near it. Just half an hour away from the city there’s a snow-covered slope.
M: Well. As the mountains are just thirty minutes away, I guess I should take my ice skate and my ski’s.
W: Definitely.
M: I heard that the weather there is great.
W: It is. No humidity, 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 to the mountains or exercise too vigorously. Just do everything gradually.
M: I’m sure I’ll be fine.
Q. 19. What’s the main purpose of the man’s trip?
Q. 20.What can be inferred about the man?
Q. 21.According to the woman, what may cause the man the most problems in the Albuquerque?
Q. 22.Which of the following details is NOT correct?