1 . Questions are based on the following dialogue.
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| A．There are numerous languages in existence. |
| B．Most public languages are essentially vague. |
| C．People differ greatly in their ability to communicate. |
| D．Big gaps exist between private and public languages. |
| A．It is a sign of human intelligence. | B．It improves with constant practice. |
| C．It is something we are born with. | D．It varies from person to person. |
| A．How various languages are related to each other. |
| B．How children learn to use language in particular ways. |
| C．How private languages are developed from public ones. |
| D．How people of different ages create their own languages. |
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