Class ____________ Number
_____________ Name
________________
10. Bell’s interest in deaf education led him ____________ (invent)
21
the microphone. 11. The original telegraph sent a
message ____________ distances using Morse code.
12. If sound waves
could be reproduced in a moving electrical
____________, they could be sent along
22
a wire.
13.The day is coming _____________ telegraph wires will be laid on to houses just like water or gas—— and friends will talk to each other without leaving home.
14. I called you up
many times yesterday,
23
but I couldn’t __________
_________. Maybe your phone was ________ ________ _________. 15. Today we
_____________ ______________ Leonardo da Vinci as one of the greatest painter, but if he had
24
相关推荐：
loading