下列计算正确的是（　　）

    My parents want to take me to visit Beijing this summer holiday. I want to plan a good trip. So I must learn something about Beijing on the Internet. Beijing is a beautiful city. Autumn is the best season. There are many places of interest in Beijing. We want to visit the Great Wall, the Palace Museum and the Summer Palace. Beijing Duck is very famous all over the world. I hope I could have a try.

    We can get to Beijing by train. I want to buy a gift for my good friend. I also want to send a postcard to my teacher. I think I will have a great holiday.

在冬季，人们在冰面凿冰捕鱼利用的原理是在冰孔处（　　）

据图示信息，分析“蓉欧快铁”运行沿线可能发生的主要自然灾害。