The prices of new houses in our city have been ________than before,  but they ______ well at

present.        [ ]

A. higher, still sell    

B. lower, are not still sold

C. higher, don't sell    

D. cheaper, are not still sold

网师园濯缨水阁悬挂一幅“曾三颜四，禹寸陶分”，为谁题词？