【简答题】The use of specialists led to very high costs.
【判断题】会计只能用货币量度进行反映和监督。 ( )
【单选题】This machine is very easy to use . _____ can learn to use it in a very short time.
【判断题】Excellent use of vocal variation, intensity and pacing are not the characteristics of an advanced speaker.
【单选题】_________that river ________very clean?