轻松掌握英语实用口语：单句20I want to buy an airconditioner.
Is this washing machine automatic or semi-automatic?
This refrigerator is of low noise design.
This TV set gives sharper pictures than others.
This stereo set is a nice design.
Is this TV set on sale?
Which one is of the best quality?
Which kind is the most durable?
How long is the warranty period?