中国大学MOOC: cement pervade discordant complement sparse vocal initiate tranquil intrigue connote There are a lot of italics. What do they to you?

Normal people have a regular pulse, but children and adolescents may have sinus arrhythmia, and the pulse is likely to occur( ) A: Diphtheria B: trigeminy C: Corresponding detachment of pulse D: Short pulse E: Corresponding discordant pulse