New computers are soon out of date since newer models are ________ constantly.
A．turned up B．turned out
C．turned down D．turned over
New computers are soon out of date since newer models are ________ constantly.
A．turned up B．turned out
C．turned down D．turned over
B 句意：由于更新型的电脑不断地被生产出来，新电脑也很快就过时了。此题考查动词词组。turn up“出现”，不能用在被动语态中；turn out“生产，制造出来”；turn down“拒绝”；turn over“翻身，翻转”。故选B。