4.It is implied but not stated in the second paragraph that ___.

　　A.traditional societies separate the child from the parent at an early age.

　　B.Children in modern societies cause more troubles than those in traditional societies.

　　C.A child did not live together with his parents among the Ngoni.

　　D.Children in some societies did not have emotional problems when separated from the parents.

　　5.The writer concludes that ___.

　　A.it is difficult to make clear what is the right age for nursery school.

　　B.It is not settled now whether early care is reasonable for children.

　　C.It is not beneficial for children to be sent to nursery school.

　　D.It is reasonable to subject a child above three to nursery school.

　　答案：BCCCD