A．metalB．massC．materialD．model

That beautiful girl is a fashion model.（英译中)

She is a model student.（英译中)

【C6】A．adequateB．profitableC．materialD．spiritual

【C4】A．directionB．guideC．symbolD．model

Which systems development life cycle models include two parts of other models？A.Rapid

Why the waterfall model simplifies task scheduling？A.The model involves the client or en