从事餐饮服务经营活动的单位和个人，必须取得《餐饮服务许可证》。()
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当次就餐时间未使用的餐具可以下次再用，无需重新消毒。()
As Edith Hamilton reminded us about Socrates, students
A. should learn knowledge from their teachers with modesty.
B. should investigate what the God has put in their hearts.
C. were encouraged to discover the truth themselves.
D. were required to find the spark to fame.
若n为自然数，(21n+4,14n+3)=_______________________。
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