单选题 Some educators try to put students of similar abilities into the same class because they believe this kind of ______ grouping is advisable.
A. homogenous B. instantaneous C. spontaneous D. anonymous

【正确答案】 A
【答案解析】[解析] 本题中,A项homogenous“同质的,纯系的”符合题意。其他三项instantaneous“瞬间的,即刻的,即时的”;spontaneous“白发的,自然产生的”;anonymous“匿名的”都不正确。