English belongs to ______ writing system.

A．the human eye is sensitive to all wavelengths
B．colors are related to wavelengths
C．there are more color-blind women than color-blind men
D．failure of rods cause color-blindness

A．There is no accurate figure of the number of sleepwalkers.
B．Stories of sleepwalkers are all fantasies.
C．Sleepwalkers can be considered half awake in their sleep.
D．Voltaire knew a sleepwalker who once danced a minuet in sleep.