Which of the following is TRUE according to the 4th paragraph?

• A、Birds hardly pay attention to their young.

• B、Baby crocodiles can look after themselves well.

• C、Some dinosaurs took care of their young.

• D、Birds and crocodiles take good care of their young.

56 （）

_________ Chicago is a beautiful city today,but_________ Chicago of the 1920s was a very dirty place.

• A、The ; the
• B、/ ;/
• C、A ; the
• D、/ ; the