Psychologists have errantly mounted an offensive against what they describe as nastiness to ward students by educators（）

单项选择题In primitive times, poetry was written to be heard. Today, we frequently overlook the of the poet’s work.

单项选择题The survey showed that （）numbers of 15-year-olds were already smoking twenty cigarettes a week.

A. essential
B. steady
C. primary
D. substantial