单项选择题
A．How can I do that B．Are you going today C．Did you get it D．Do you have that E．Would you like my help F．Yes，I know G．NO，I don’t know H．Can I sell my used books
A. taking medicine B. seeing a doctor C. leaving it to your body D. making a joke to your friend
A. our brains shrink as we grow old B. the front section of the brain does not shrink C. seventy-year-olds have better brains than sixty-year-olds D. brain contraction may vary among people of the same age