A. Blow air between two sheets of paper and the paper closes. This is because the air velocity in the middle of the paper is large and the pressure is small; The pressure on the outside of the paper is constant, the paper is subjected to inward pressure greater than outward pressure, the paper is subjected to inward pressure greater than outward pressure, and the paper moves closer to the middle under the action of pressure difference, which does not conform to the meaning of the question;

B, put a piece of paper on your mouth and blow it hard from the top of the paper, because the air speed above the paper is high and the pressure is low, and the air speed below the paper is low and the pressure is high, so the paper floats because of a vertical pressure difference.

C, the straw sucks the drink, and the function of atmospheric pressure is used to make the drink rise, so it conforms to the meaning of the question;

D. When the funnel is blown hard, the air flows out from the funnel wall at a relatively high speed, and the air in the upper part of the table tennis ball has a relatively high speed and a relatively low pressure. The atmospheric pressure under the table tennis is constant, so the table tennis won't fall.

So choose C.