发病率是在一特定的时间段内感染疾病的人群的比例。
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Cicerosaid,“Indoingso,Ididnotthinkitnecessary（）
Wepromisethatwe’llmeetagainafterwe_______ourcollegeeducationinthreeyears’time.
Lookatthisgroupofpeople______beachvolleyball.
Ifyoutrytolearntoomanythingsatatime,youmayget________.
Howmanypartsdoesascienceandtechnologypaperconsistof?Whatarethey?