广播电视拥有四种资源，其中被视为广播电视社会和经济效益最终源泉的是
A. 频率资源
B. 时间资源
C. 受众资源
D. 节目资源
______ travels faster than ______.
A. The light, sound
B. Light, the sound
C. Light, sound
D. The light, the sound
A) occur C) take placeB) happen D) come about
A. occur
B. happen
C. take place
D. come about
A) rock C) rainB) ice D) mud
A. rock
B. ice
C. rain
D. mud
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