“李东垣医如丝弦新短，一鼓而竽籁并熄”中的“竽籁”指（）

A.琴声

B.乐器

C.细微的声音

D.美好的音乐声

E.很少听到的声音

Which is not a characteristic of an RISC processor ( )

A．a high clock speed

B．a highly optimized pipeline

C．a few general-purpose registers

D．a limited amount of small instructions