34．―Do you know the girl _________-is singing under the tree?

      一Yes，I do．

      A．who                    B．whom                  C．which                    D．she

33．一__________ is Liaocheng，do you know?

      ―Oh，it covers about 8，900 square kilometres．

      A．How many           B．How much           C．How big                D．How long