一 I _____ sleepy today.

— Drink some tea, and you'll be good as new. [ ]

A. feel

B keep

C. turn

D. grow

核内中子数为N的R²⁺，质量数为A，则ng它的氧化物中所含质子的物质的量是

A．n(A-N+8)/(A+16) mol

B．n(A-N+2)/(A+16) mol

C．n(A-n+10)/A mol

D．n(A-n+16)/A mol