Although in the mid-1940s term length at black schools was approaching that in white schools, the rapid growth in another important measure of school quality, school expenditures, may be explained by increases in teachers’ salaries, and historically, such increases have not necessarily increased school quality.
23. Which one of the following statements about schooling in the United States during the mid-1940s can be inferred from the passage?
(B) The teachers in white schools had more time to cover material during a school year than did teachers in black schools.
(D) White schools did not change substantially in quality.
答案B 问COVER MATERIAL是什么意思？ | 
