单选题
None of these______ is an end in itself. They are tentative, experimental. They are movements not towards something definite but away from something definite.
【正确答案】
B
【答案解析】解析：B项expedients意为“权宜之计”，如He thought it expedient not to tell his wife where he had been(他认为不告诉妻子他去过哪里是适宜的)。根据空格处的意思“这些都是权宜之计，根本不是最终目标”，故选B。A项assurance“确信，断言，保证，担保”；C项awareness“知道，晓得”；D项doubts“怀疑，疑惑，疑问”，均不符合题意。