31. The skin, lungs, and digestive system __________.
A. transport broken-down chemicals out of the body
B. are not affected by drugs
C. always speed up when drugs enter the bloodstream
D. always slow down when drugs enter the bloodstream
perhaps D always slow down when drugs enter the bloodstream because when people take drugs, from what I know, they are usually drowsy and feel very heavy and dont feel like doing anything.
