Recently, the CCTV children's program "Big Windmill" has a column to introduce some popular science knowledge to primary and secondary school students, and one of the programs introduces a program cal

Recently, the CCTV children's program "Big Windmill" has a column to introduce some popular science knowledge to primary and secondary school students, and one of the programs introduces a program called " Xiaoming lives on the floor of 2 1. In the process of elevator ascending, with the increase of height, the atmospheric pressure decreases, so the external air pressure becomes smaller and smaller, and the air pressure inside the bottle is greater than that outside the bottle. Therefore, under the action of the reasons in the bottle, the liquid level in the glass ball drops and the liquid level in the glass tube rises.

So choose C.