Questions 20 to 22 are based on the passage you have just heard.

单项选择题A.The two sides of their brain develop simultaneously. B.They are better able to adapt to the surroundings. C.Their bones mature earlier. D.They talk at an earlier age.

单项选择题A.There was nothing left except some pie. B.The man has to find something else to eat. C.The woman is going to prepare the dinner. D.Julie has been invited for dinner.