1.acquiesce v.同意默许(to agree or consent quietly without protest; consent)
例:Where once the union had acquiesced to the prejudices of its English-speaking members by supporting the imposition of an alien tax on immigrant workers, after 1897 the United Mine Workers made a determined effort to enlist lta¨anS and Slavs in its ranks.
派生词:acquiescence( n.默许 )
2.acquire v.取得，获得( to come into possession or control of)
词根记忆：ac+quire(追求)一不断追求一获得
例:The United States acquired sovereignty over New Mexico in 1848.
派生词:acquisition(n.获得;采购)
3.acquisition n.获得物( something or someone acquired or gained)
词根记忆:来自acquire(v.获得)
例:One example of social learning js the acquisition of preferences for novel foods.
同根词：acquisitive(a.贪得的；想获得的)
4.acreage n.英亩数( area in acres)
词根记忆:来自 acre(n.英亩)
例:Because of improvements in agricultural technology, the same amount of acreage produces double the number of apples.
5.activate v.使活动，激活( to make sth. active)
词根记忆：act(行动)+ivate(使成为)一使动起来一激活
例:Protein synthesis begins when the gene encoding a protein is activated
派生词:activation(n.活化，激活)
同根词：active(a．积极的，主动的)；activism(n.行动主义，激进主义)
6.activism n.行动主义；激进主义(a doctrine or practice that emphasizes direct vigorous action)
词根记忆：act(行动)+iv+ism(主义)一行动主义
例:Her activism predated her husbands presidency and her projects differed from his.
同根词：active(a.积极的)
7.activist n.积榜分子( one that is active)
词根记忆：来自active(a.积极的：主动的)
例:community activist 社区积极分子
同根词：activity(n.活跃；活动)
8.acute a.灵敏的( sensitive)；严重的(serious)
词根记忆：acu(尖端)+te一尖端的一灵敏的
例:The sense of smell in adult female rats is more acute than that in rat pups. //an acute parking shortage 停车位严重不足
同根词：acumen(n.敏锐)
9.adapt v.（使）适合，逅应（to make sth. fit often by modification）
词根记忆：ad+apt(适当的)一使适合
注意：adopt(v.采用;收养)
例:A biocontrol agent may adapt in unpredictable ways, so that it can feed on or otherwise harm new hosts.
派生词:adaptability(n.适应性)；adapted(a.合适的)；adaptive(a.适应的)
10.adaptation n.适应( adjustment to environmental conditions)；改编(something that is adapted)
词根记忆:来自adapt(v.使适应)
例:The disadvantages of an adaptation to a particular feature of an environment often outweigh the advantages of such an adaptation.
同根词：adaptive(a.适应的；适合的)