Unit 1 Will people have robots?
d. the way that tv signals are sent
5. from the passage we can infer (推測) that ______.
a. tv has begun to be used for educational purpose(目的)
b. viewers can receive more tv programs with their ordinary antennas
c. cable tv can not be used in small towns
d. antennas for cable tv are usually put up in the center of a community
keys: cadba