The wonderful improvements come from Nocera's recent discovery of several powerful，new and inexpensive catalysts. These catalysts make the energy transformation inside the leaf more efficient with water and sunlight. Right now，the new leaf is about 10 times more efficient at carrying out photosynthesis than a natural one. Besides，the device can run in whatever water is available；that is，it doesn't need pure water. This is important for some countries that don't have access to pure water.

　　With the goal to “make each home its own power station” and “give energy to the poor”，scientists believe that the new technology could be widely used in developing countries，especially in India and rural China.

　　33．Which of the following orders correctly shows how the artificial leaf is used to produce electricity?

　　a．artificial leaves split water into hydrogen and oxygen

　　b．the hydrogen and oxygen gases are stored in a fuel cell

　　c．the artificial leaves are put in water

　　d．the fuel cell uses hydrogen and oxygen to produce electricity

　　A．c，b，a，d

　　B．c，a，b，d

　　C．b，c，a，d

　　D．c，a，d，b

　　34．The purpose of the scientists at MIT in developing the new artificial leaf is to________.

　　A．build up more power stations in the world

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