题目内容：

It's not just adults who have a thing or two to discuss with other people, babies too have their own social lives and enjoy group interaction, according to a world-first study.

The breakthrough study conducted by psychologist Professor Ben Bradley, at Charles Sturt University, could completely transform the way child-care centers are set up. In their study, the researchers examined groups of nine-month-old babies in new South Wales and Britain.

And they came across astonishing results—it was found that infants had “social brains” and focused not just on their mothers but on social 1ife in groups as well,

“They communicate with more than one baby at once，and show jealousy and generousness，”said Professor Bradley．

He added，“They develop their own meanings through group interaction，they notice if a group member is behaving differently and they take on roles，such as leaders and followers．”

“A baby who has a depressed mother tends to be withdrawn(内向的)，but put that same baby in a group of its peers(同龄人)and they behave and interact like any other baby．”

It was the first all-baby group study ever to be conducted．“Most studies of babies concentrate on the infant-mother relationship，assuming that is the single foundation for mental health．but babies are constantly involved with groups of people other than their mothers：fathers，siblings，grandparents and those taking care．Therefore。the ‘mother-baby approach’ needs to be combined with a‘ group approach’．”said Bradley．

Phoebe Christison ，a child-care worker at Camperdown Sunshine Bubs in Sydney’s inner west．said she often noticed what appeared．to be emotional attachments developed between toddlers．

She said，“Joel(10 months)and Isabella (11months)always like to hold hands when they sit in their high chairs and eat．And babies definitely show jealousy．They push and touch each other，and copy what the other is doing．”

1.A baby who has a depressed mother ____  ．

A．tends to be a follower

B．also enjoys group interaction

C．has poor social ability

D．pays more attention to its mother

2.What can be inferred from the result of this study?

A．Babies are affected by groups more than by their mothers．

B．There’s no need of child-care centers at a11．

C． Adults should include babies when having social activities．

D．The normal infant-mother bond alone isn’t enough for the good mental health for babies．

3.The underlined word “toddlers” in Para．8 can be replaced by_________

A．adults            B．infants            C．peers            D．groups

4.The example given in the last paragraph proves that a baby________ .

A．is born to be friendly to other babies

B．has interest in peers as well as in its mother

C．may have emotional attachments to another baby

D．shows jealousy and generousness as an adult