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1. Thirteen is thirteen, thirty is thirty. Thirty is not thirteen, thirteen is not thirty.

2. Fourteen is fourteen, forty is forty. Forty is not fourteen, fourteen is not forty.

3. Fifteen is fifteen, fifty is fifty. Sixteen is sixteen, sixty is sixty. Seventeen is

seventeen, seventy is seventy. Eighteen is eighteen, eighty is eighty.

Niteteen is nineteen, ninety is ninety.

Don't say 19 is ninety or 90 is nineteen.

试题答案

“略”