TOEFL Reading: ETS-TOEFL阅读机经 - J1VP8Y64106366S4L$

Paragraph 2 suggests that Thomas Edison's early efforts to develop a motion-picture camera failed because he could not figure out how to A. display the camera's pictures to an audience B. move the film quickly through the camera C. line the edge of the film with holes that were small enough D. prevent the film form tearing