During the 29th Olympic Games, as the marathon lead car and TV shooting cars, cars equipped with "green heart" - proton exchange membrane fuel cells, its work!

A, according to the electrode reaction law of the fuel cell: the electrode that passes into the air (containing oxygen) is the positive pole, and the reduction reaction occurs, so A is wrong;

B, according to the electrode reaction law of the fuel cell: the electrode that passes into the fuel hydrogen is the negative pole, so B is wrong;

C, the electrode that passes into the oxygen is the positive pole, and the electron-gaining reduction reaction occurs on this pole, and in an acidic environment. Electrode reaction: O2 + 4H + + 4e- ═ 2H2O, so C is wrong;

D, in the fuel cell, according to the law of the electrode reaction of the fuel cell: the total reaction that is the chemical equation of fuel combustion, that is, O2 + 2H2 ═ 2H2O, so D is correct.

The choice of D.