The doctor’s tests show that __________. ·our brains shrink as we grow older ·the front sectioof the braidoes not shrink ·sixty-year-olds have better brains thathirty-year-olds ·some people’s brains have contracted more thaother people’s
答案是:单选题 ·why certain people age sooner than others ·The study of brain volumes of different people. ·our brains shrink as we grow older