Sally and her granddaughter play peekaboo regularly. At first, Sally starts the game and her
granddaughter is an amused observer. By 12 months, the granddaughter actively
participates, trading roles with Sally. Sally is helping her granddaughter
A)learn how to overextend and underextend.
B)understand the turn-taking pattern of human conversation.
C)develop a referential style of communication.
D)understand telegraphic speech.
Childhood obesity in China
A)is influenced by cultural beliefs that excess body fat represents prosperity and health.
B)is especially high in rural regions and nearly nonexistent in urban areas.
C)is far more prevalent among young girls than among boys.
D)peaked in the 1980s and has decreased in the last 25 years.
In medieval times,