单项选择题

The author probably feels that twins' problem （）

A．can not be solved because situation 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

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单项选择题

The writer mentions all of the items listed below except （）

A．twins can help each other
B．twins share each other's emotion
C．twins are able to understand each other in a private language
D．twins communicate less with their parents

单项选择题

What' s the reason for twins to be at a disadvantage in their intellectual development（）

A．They can only understand their own private language.
B．They communicate with outsiders less than non-twins.
C．There is little stimulation for them.
D．Adults don' t like to talk with them.