The word “subjects” iparagraph 5 means__________. ·something to be considered ·branches of knowledge studied ·persons choseto be studied iaexperiment ·any member of a state except the supreme ruler
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 ·persons chosen to be studied in an experiment