Other experiments have since managed to conquer light’s supposed speed limit, though all claims have had fine print that keeps them from being especially groundbreaking(创新的). Those seeking to truly prove Einstein wrong must instead turn to objects like black holes, which could theoretically cause things to move at faster-than-light speeds. Black holes have been proven to be particularly uncooperative test subjects though, and for now this remains a guess.

　　12. What did the scientists think before 1998?

　　A. The universe would expand more slowly.

　　B. Empty space was full of dark energy.

　　C. The universe would expand faster.

　　D. There was nothing in the space.

　　13. Which of the following is TRUE according to the passage?

　　A. Three fourths of the universe is made up of dark energy.

　　B. Dark energy has a positive pressure because of its surroundings.

　　C. We have changed our understanding of the universe.

　　D. Dark energy has been discovered.

　　14. From the fourth paragraph, we know that the scientists found ______ .

　　A. a vapour

　　B. a vacuum.

　　C. something traveling faster than light.

　　D. a small pulse of laser light.

　　15. What can be inferred from the passage?

　　A. The pulse traveled exactly 300 times faster than light.

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