Analysis of test questions: the molecular formula of peramivir is C 15 H 28 N 4 O 4, (1) peramivir is composed of four elements, and each molecule of peramivir contains 15 carbon atoms, 28 hydrogen atoms, 4 nitrogen atoms and 4 oxygen atoms, * * 5 1 atom. (2) Setting off firecrackers and burning incense to worship Buddha is superstitious and unscientific. Killing birds in an all-round way will cause ecological problems and we have to try.

Comments: The calculation of chemical formula has appeared more in the senior high school entrance examination in recent years. The difficulty lies in the examination and calculation. Pay attention to the questions carefully and don't take them for granted.