Baby sign language is a growing movement.Pointing to a colorful flower, Tricia Campbell lifts her baby's soft hand, and rapidly moves it from one side of his nose to the other as she sniffs (嗅) loudly.“Flower！”she says loudly.Gregory smiles, looks carefully and says happily, “Flower！”It could be a year before Gregory, 4 months old, can speak, but now his mother hopes to communicate with her baby through sign language.
Like others around the world, Campbell is part of a growing movement of parents teaching hearing babies simple signs to communicate before they can talk.The baby sign language has been more popular in recent years.The movie，“Meet the Fockers”，where Robert De Niro's character teaches his young grandson to sign, makes it well developed.
Babies generally begin to talk between 12 and 15 months, but babies can use sign language to communicate before they learn how to speak.
“They are understanding words before they are able to say them.From around 16 to 18 months, they might say 50 words but understand 200.They understand short sentences well.”says McRoberts.
Studies have shown deaf children learn to use sign language earlier than hearing children learn to speak meaningfully.As to whether hearing babies can communicate earlier with sign language, McRoberts says，“I think that's still unknown.It may not.I'm very interested in that very question.”
56．In the whole passage, the first paragraph is written to ________.
A．show how Tricia Campbell taught her son “flower”
B．show Gregory can use baby sign language
C．introduce baby sign language
D．mean baby sign language is easy to learn
57．The underlined word “it” (in Paragraph 2) probably refers to________.
A．how to teach a grandson
B．making baby sign language meaningful
C．the movement of teaching babies sign language
D．the movie, “Meet the Fockers”
58．Many parents teach their babies sign language mainly to ________.
A．make their babies clever
B．make their babies learn English fast
C．communicate with their babies
D．make their babies interested in language
59．What does the word “generally” mean?
A．At first. B．As a rule.
C．Sooner or later. D．At once.