B, flying at high altitude, the air velocity outside the cabin is large, and the pressure is small, which is less than the pressure inside the cabin, which does not meet the meaning of the question, so B is wrong;
C. Suck the beverage out of the bottle with a straw. When inhaling, the air pressure in the straw decreases, which is less than the external atmospheric pressure. The beverage enters the mouth under the action of atmospheric pressure, which accords with the meaning of the question, so C is correct;
D, the pressure cooker is cooking, and its internal pressure is greater than atmospheric pressure, which does not meet the meaning of the question, so D is wrong.
So choose C.