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"This is a very exciting technology,says Liu Xiaomeng,a graduate student in electrical andcomputer engineering in UMass Amherst's College of Engineering and the paper's lead author."Itgenerates real green energy,and unlike other so-called 'green-energy'sources,its production istotally green.That is because this biofilm-which is a sheet of bacterial cells and as thin as a sheet of paper-is produced naturally by an engineered version of the bacterium Geobacter sulfurreducens.Gsulfurreducens is known to produce electricity and has been used previously in"microbial batteries"to power electrical equipment.But such batteries require that G sulfurreducens be properly cared forand fed a constant diet.By contrast,this new biofilm,which can supply as much energy as acomparably sized battery,works continuously,because it is dead.And because it is dead,it doesn'tneed to be fed.The secret behind this new biofilm is that it makes energy from the moisture (on yourskin.While we daily read stories about solar power,at least 50%of the solar energy reaching theearth goes toward evaporating water."This is a huge,undiscovered source of energy,"says Yao Jun,professor of electrical and computer engineering at UMass Amherst,and the paper's one seniorauthor.Since the surface of our skin is constantly moist with sweat,the biofilm can "plug into"it andchange the energy locked in evaporation into sufficient energy to power small equipment."Our nextstep is to increase the size of our film to power more intelligent wearable electronics,"says Yao,andLiu points out that one of the goals is to power entire electronic systems,rather than single equipment.32.Which of the following can biofilm do according to the first paragraph?A.Update wearable electronics.B.Get power from evaporation.C.Supply energy to microbial batteriesD.Transform the way of generating electricity.33.What is the advantage of the biofilm compared with "microbial batteries"?A.It is comparatively thinner.B.It is environmentally friendly.C.It adopts a rare energy source.D.It decreases the cost in usage.34.How does the biofilm power small devices?A.By interacting with solar power.B.By making electricity out of sweat.