Alfred Roca, assistant professor in the Department of Animal Sciences at the University of Illinois, said, “We now have to treat the forest and savanna elephants as two different units for conservation purposes.Since 1950, all African elephants have been conserved as one species.Now that we know the forest and savanna elephants are two very distinctive animals, the forest elephant should become a bigger priority(优先) for conservation purposes.”

　　67．One of the fossils studied by the researchers is that of________.

　　A．the Asian elephant

　　B．the forest elephant

　　C．the savanna elephant

　　D．the mastodon elephant

　　68．The underlined word“divergence” in Paragraph 4 means “________”．

　　A．evolution

　　B．exhibition

　　C．separation

　　D．examination

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

　　A．DNA

　　B．height

　　C．weight

　　D．population

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

　　A．The conservation of African elephants.

　　B．The purpose of studying African elephants.

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

　　D．The reason for the distinction of African elephants.

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