Which of the following speeches is ceremonial?（ ）
A、Aspeechsuggestingtheimportanceofsleep.
B、Aspeechintroducingthebenefitsofsleeping.
C、Aspeechcelebratingthefoundingofasleepingresearchcentre.
D、Aspeechinformingaboutanewstudyonhowsleepinghelpsusfocusbetter.
发布时间：2025-11-11 08:35:00
