A．people’S preference for skyscrapers is increasing rapidly．
B．people made mistakes in constructing tall bnildings in the past．
C．tall buildings in the l960s and l970s were welcomed by Londoners． 
D．tall buildings in the l960s and l970s left people deep impression．

单选题回答题：


The rclationship between the second and third paragraphs is that

A．the third is a subeategory of the second．
B．the third is lhe logical cause of the second．
C．the second generalizes and the third gives examples．   
D．both present the value of Picasso's paintings．

A．bought art works oil the advice of auctioneers．
B．had their own judgment of the value of art works．   
C．collected for the purpose of investment．
D．collected in order to achieve social status．