A．evolution

　　B．exhibition

　　C．separation

　　D．examination

　　38．The researchers' conclusion was based on a study of the African elephant's________.

　　A．DNA

　　B．height

　　C．weight

　　D．population

　　39．What are Alfred Roca's words mainly about?

　　A．The conservation of African elephant.

　　B．The purpose of studying African elephant.

　　C．The way to divide African elephants into two units.

　　D．The reason for the distinction of African elephants.

　　40．Which of the following can be the best title for the passage?

　　A．Naturalist' Beliefs about Elephants

　　B．Amazing Experiments about Elephants

　　C．An Unexpected Finding about Elephants

　　D．A Long Scientific Debate about Elephants

　　What will power your house in the future？Nuclear，wind，or solar power？According to scientists at the Massachusetts Institute of Technology(MIT)in the US，it might be leaves—but artificial(人造的)ones.

　　Natural leaves are able to change sunlight and water into energy.It is known as photosynthesis(光合作用)．Now researchers have found a way to imitate this seemingly simple process.

　　The artificial leaf developed by Daniel Nocera and his colleagues at MIT can be seen as a special silicon chip with catalysts(催化剂)．Similar to natural leaves，it can split water into hydrogen and oxygen when put into a bucket of water.The hydrogen and oxygen gases are then stored in a fuel cell，which uses those two materials to produce electricity，located either on top of a house or beside the house.

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