Drinking Straw

1. Drinking straw 1 . 1 is a perspective view of a drinking straw showing our new design; 1 . 2 is a front elevation view thereof; 1 . 3 is a rear elevation view thereof; 1 . 4 is a right side elevation view thereof; 1 . 5 is a left side elevation view thereof; 1 . 6 is a top plan view thereof; and 1 . 7 is a bottom plan view thereof. The broken lines in the drawing depict portions of the drinking straw that form no part of the claimed design.