The author probably feels that twins’ problem 

• A、can not be solved because solution is very cruel

• B、can be solved because twins will be separated

• C、can not be solved unless the twins are forced to live in an ordinary environment

• D、can be solved if the adults communicate with them more often

59（）

The dog has always been noted for

• A、protecting children

• B、assisting shepherds

• C、helping hunters

• D、herding cattle