The weatherman broadcasts the ______ in temperature twice a day.A．diversionB．variationC．va

_____ the compression ratio, _____ the proportion of the heat energy of the combustion tur

From the passage we gather that the two speakers are in_________.A．the WestB．the EastC．the

The police asked the children______ cross the street______the traffic lights turned green.

Compared with public television, commercial television______.A．broadcast programs which do

The respondent would advise the new channel to______.A．train broadcasters with higher stan

It was not until 1920 ______ regular broadcast began.A、whileB、whichC、thatD、since