6.1日 TPO9
The lecture and the reading passage give
contradictoryopinions(中间加空格) on the topic of hydrogen-based fuel-cell engines. The passage explains that the fuel-cellengines will replace the internal combustion engines whereas the lectureprovides several counterarguments to this view.
Firstly, reading passage argues that
hydrogen can be easily reachable because it can be obtained from numeroussources, such as natural gas and water, but internal-combustion engine dependson petroleum that is non-renewable resource. On the contrary, the lecturer contends that,in fact, hydrogen is not easily available substance since it must be gained inpure liquid state. Nevertheless, it
istechnological difficult to produce and store pure liquid hydrogen because i
tneeds an extremely cold environment.
Lecturer also refutes the second point in the readingpassage that fuel-cell engine produce less pollution as its by-product is onlywater. The lecturer asserts that producing pure hydrogen release a great deal
ofpollution. According to the lecturer, in the purification process, a
largeamount of) coal and oil are burned in order to gain energy, and therefore it
createspollution.
Finally, while the reading passage suggests that the fuel-cellengine is more economical than the internal-combustion engine, the professorargues that it is very expensive to produce the fuel-cell engine because itrequires a rare mental-platinum. In addition, there is not alternative metal toreplace platinum so far.
All of this means that hydrogen-based –fuel-cell engine is notthe solution to replace internal-combustion engine.
-- by 会员 joan31217 (2012/6/3 3:50:53)