I was waiting for a phone call from my agent．He had left a message the night before, telling me that my show was to be cancelled．I called him several times, but each time his secretar
Twelve-year-old Paul Crossnickle has lived as a hero for six years now. It wasn’t until he wrote a composition for a recent class project, however, that he got the recognition he should have got. On
，
，则M∩N=（ ）
} B．{
} 
} D．{
}