______ ,There was a revival in literacy.

A．dogs are more domesticated than cats
B．dogs are more lovable animals than cats
C．though different, dogs and cats have their charms
D．both dogs and cats can be kept as pets in one house

A．it is fairly easy to determine literacy
B．there is no illiteracy in a rich family
C．history sees an even progress towards literacy
D．in history literacy suffers ups and downs