A) gasoline is the cheapest source of hydrogen

　　B) gasoline is a available source of hydrogen

　　C) gasoline is an environmentally sound source

　　D) gasoline is being used by many rich countries

　　7. The greatest part of the hydrogen economy lies in the derivation of hydrogen from ________.

　　A) fossil fuels

　　B) electrolytic water

　　C) renewable sources

　　D) hydrocarbon-molecules

　　8. The big problem with hydrogen involves its storage and transportation, for it is massive but not suitable for ________________.

　　9. There is an obstacle for the construction of hydrogen stations and the transportation infrastructure, which can be overcome with the advent of a dominant _______________.

　　10. Cars using gasoline-powered fuel-cell have such advantages over traditional ones as higher efficiency and less.________________.

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