81.The beginning of the passage indicates that
A.researchers have found out what shapes us.
B.our peer is the last factor influencing us.
C.what researchers found contributes in a limited way.
D.what researchers found is good and trustworthy.
82.In the third paragraph, the author tries to demonstrate that our siblings
A.offer us much useful information.
B.have great influences on us.
C.are the ones who love us completely.
D.accompany us throughout our life.
83.In scientific community, previous research on siblings
A.mostly focused on the sibling order.
B.studied the characteristics of the kids.
C.studied the matter in a broad sense.
D.wasn’t believable and the discussion ended.
84.Which of the following is NOT sibling dynamic?
A.A brother cautions his sister against getting into trouble.
B.Sisters have quarrels with each other.
C.Siblings compete for parental favoritism.
D.Older kids in a family try hard to achieve.
85.From the last paragraph，we can conclude that
A.managers learned management skills from the family playroom.
B.spouses learned negotiation skills from their siblings.
C.studies on siblings are under the way。
D.studies on siblings need thorough investigation.