【C20】A．resultB．reasonC．purposeD．cause

What is the purpose of the passage？A．To analyze the causes of the panics and teach people

A fireman discovered the______of the fire.A．truthB．reasonC．causeD．fact

【C17】A．resultB．phenomenonC．behaviourD．appreciation

【C7】A．resultB．reasonC．causeD．phenomenon

What is the conversation mainly about？A．The purpose of laughter.B．The cause of laughter an

A．resultB．effectC．indicationD．sequence