"what basic problem is reflected in the communication difficulties and impaired social relationships of asd children? "

The basic problem reflected in the communication difficulties and impaired social relationships of ASD children is that the mutual give and take of normal, or typical communication and interaction is specially challenging for children with ASD.  This results in their impossibility to play  with other children, they may fail to respond to their name, they cannot understand their own feelings or other people's feelings, therefore, they cannot talk about their own feelings.  Their speech can often be awkward and inappropriate.

balearic sea - is a body of water in the mediterranean sea around the balearic islands. baltic sea - is a mediterranean sea of the atlantic which is enclosed by scandinavian and baltic countries. barents sea - is a marginal sea in the artic ocean located off the northern coast of norway and russia.