21.What does the underlined sentence probably mean according to the passage?
A. Dictionaries are open to the public.
B. Dictionaries are helpful to the public.
C. Dictionaries are ready to welcome new words.
D. The vocabularies in dictionaries are limited.
22.Dodgson’s made-up words__________.
A. are based on different words
B. Are borrowed from other languages
C. All come from his poems
D. Are still widely used
