A have higher demands of museums
B are open to more people with different social background
C to lengthen their opening hours
D charge too little for admission
E have been built and open to public
F by lowering the admission fees
Now museums are no longer restricted to the privileged few, but______.

A．they must tolerate phone disturbances or miss important calls
B．they must turn off their phones to keep their homes quiet
C．they have to switch from a desktop phone to a cell phone
D．they are too busy to make phone calls

A．road
B．channel
C．way
D．path