无线电寻呼系统是将自动电话交换网送来的被寻呼用户的号码和主叫用户的消息，变换成一定码型和格式的数字信号，经数据电路传送到各基站，并由基站寻呼发送给被叫寻呼机的系统。
1、正确正确
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Theforeigners_________there,butthey_________thefoodthereatfirst.
Marykeepstalkingabouttheparty.Shehadaverygoodtime,______she?
Asisknowntousall,theage_____childrencangotoschoolisseven.
Tammy:Someoneisatthedoctor.
Richard:______.
Asthenumberofparticipantshasincreasedfrom60to98,wewonderifwecanuseLectureHall'A'as'B'willbetoosmall.
