简述药材贯众的来源有哪些、如何鉴别。
A clear advantage of distance learning is the significantly enhanced level of flexibility ____1compared to traditional courses.Rather _____2 being tied to academic term dates-which mightmean waiting almost a whole year should an enrollment deadline be missed-distance learning can generally start at any time.This means that you can gain your qualification as quickly as possible and maximize employment opportunities.With distance learning,you progress ____3 your own pace and submit work or take exams when you are fully ready to do so.This means that if other areas of your life suddenly demand more attention-such _____4 job hunting or increased commitments at work-then you can simply put your studies_____5 hold and return to them when things have calmed down.
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