—I’d like to make an appointment with Doctor Smith. Would 9:00 tomorrow be all right?

—     . Her schedule is full in the morning.

A．Yes, she’s free then

B．I’m afraid not

C．You must be joking

D．Wel1, it depends

下图是气体制取装置，下列能用此装置制取气体并能“随开随用、随关随停”的是

A．大理石和稀硫酸制取二氧化碳

B．锌粒和稀硫酸制氢气

C．浓盐酸和二氧化锰制取氯气

D．电石和水制取乙炔