Baby talk refers to the sounds made by babies and imitated by parents in the first few weeks after birth

Reading and talking about a children’s picture book ________ children’s language skills

a. is an effective way to improve b. will have no impact on c. actually slows down the development of d. is not as good as watching a video when it comes to

Haier believes his research shows that higher intellectual performances are related to

a. greater brain efficiency. b. having larger corpus callosums. c. having "harder working" brains. d. all of these.