56．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

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

　　A．build up more power stations in the world

　　B．provide cheaper energy for developing countries

　　C．offer people in developing countries access to pure water

　　D．gain a deeper understanding of the photosynthesis process

　　58．The main idea of this passage is ________.

　　A．an introduction to the history of artificial leaves

　　B．an invention copying photosynthesis

　　C．giving energy to the poor

　　D．a mixture of water power and solar energy

　　59．The underlined word “imitate” in Paragraph 2 can be replaced by “________”．

　　A．produce

　　B．hold

　　C．prevent

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