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．<br/>

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<br/>

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<br/>

A is a legend handed down from the past B is reflected in sounds and letters C dates back to the prehistoric period D is a problem not yet solved

A they could agree upon certain signs B they could write them down C they could communicate with each other D they could combine them

A They are used to express feelings only． B They can not be written down． C They are represented either by sounds or letters． D They are visual letters．

A accuracy B beauty C charm D representative function

A why the stem of the tree is wood B how the banana grows on the stem C why the banana tree is not a tree D how the leaves grow out of the stem

A the leaf B the stalk C the stem D the plant<br/>

A On the stem． B On the leaves． C On the flower stalk． D On the base of the stem．<br/>