ACCORDING TO THE PASSAGE, HOW DID EDISON TEST HIS NEW INVENTION

5. - NGAN HANG CAU HOI K10 HK1NH 2009 2010
NGAN HANG CAU HOI K10 HK1NH 2009 2010
5. According to the passage, how did Edison test his new invention?A. He made improvements to the machine.B. He used a carbon transmitter.C. He read a children’s rhyme.D. He reproduced the audience’s voice.Key : 1. A 2. D 3. C 4. B 5.C