[ Vocabulary ]
floating
A. buoyancy
B. transgressions
C. retroactive
D. humiliation

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Which of the following is a detail from the section “A New Lab”?
A. He was allowed to set up a science lab in a baggage car until an accidental fire ended his experiments.
B. There, Edison worked tirelessly for many hours each day, and many of his employees worked just as hard.
C. After a few years, Thomas Edison decided that he wanted to become a full-time inventor.
D. Sitting in the dark for a few moments, people could think about the great changes Thomas Edison had made in their lives.