题目内容

1．The development of electronics has had three important steps:（）, （）and（）.

A. computer
B. vacuum tube
C. transistor
D. integrated circuit

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2．The first application of electron tubes were in（）.

A. radio
B. television
C. communication
D. broadcasting

3．（）had surpassed radio for home use and entertainment.

A. Communication
B. Television
C. Video camera
D. Personal computer

4．Using echoes of radio microwaves, radar can detect（）.

A. a car
B. a ship
C. a plane
D. rain

5．The first electronic computer included 18,000（）and used 200 kilowatts of electrical power.

A. transistors
B. vacuum tubes
C. ICs
D. electronic components