D．dark energy makes up about three quarters of the universe

　　7．The text tells us “dark matter” ________.

　　A．plays an important part in forming stars，planets and humans

　　B．has been fully understood by researchers

　　C．remains an unimportant force to the universe like dark energy

　　D．has nothing to do with the formation of the universe today

　　8．“The major forces and substances that shaped our world” (in Para. 2) refers to ________.

　　A．luminous matter B．non­luminous matter

　　C．dark matter

　　D．ordinary matter

　　9．According to Paul Steinhardt，our existence today ________.

　　A．depends mainly on dark matter

　　B．has something to do with ordinary matter

　　C．results from the formation of celestial objects

　　D．evolves from the mass of the universe

　　10．Which of the following is the best title for the passage?

　　A．Dark Matter or Dark Energy

　　B．The Formation of the Universe

　　C．Dark Forces Dominate the Universe

　　D．Unknown Forces Puzzle Astronomers

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