170. The passage mentions which of the following as an

important theme that receives special emphasis in

Glarthaar’s book?

(A) The attitudes of abolitionist officers in Black units

(B) The struggle of Black units to get combat assignments

(C) The consequences of the poor medical care received by

Black soldiers

(D) The motives of officers serving in Black units

(E) The discrimination that Black soldiers faced when trying

for promotions

如何在该题干确定定位词？