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

　　66. 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

　　67. The underlined word “divergence” in paragraph 4means “________”

　　A. evolution

　　B. exhibition

　　C. separation

　　D. examination

　　68. The researcher’s conclusion was based on a study of the African elephant’s ____________

　　A. DNA

　　B. height

　　C. weight

　　D. population

　　69. What were Alfred Roca’s words mainly about?

　　A. The conversation 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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