1.approbation n.赞成，同意(sanction)

词根记忆：ap(表加强)+prob( =prove证实)+ation --证实是好的--赞成

例:qualified approbation有条件的赞成

2.appropriate a.适当的，相称的(fitting, suitable)

词根记忆：ap+propri（适当的）+ate --适当的

例:The tropical wildlands that are still relatively intact do not provide appropriate habitats for reproduction.

3.appropriation n.拨款(money set aside by formal action for a specific use)

例:appropriations for the military services军备拨款

4.approval n.批准：认可；赞成( an act or instance of approving)

词根记忆：来自approve(v.批准：认可；赞成)

例:Such approvalis denied if the commander judges that the evidence on which the provisional arrest is based is insufficient.

同根词：disapprove(v.不赞成)

5.approve v.赞成（to accept as satisfactory）；批准，认可（to ratify）

词根记忆：ap(一再)+ prove(证实)--再证实是好的--赞成

例:The board has approved an annual salary of over one million dollars for our company's chief executive officer.

派生词:disapprove(v.不同意)；approval(n.赞成；批准)

6.approximate v.接近(to bring near);a.近似的，大概的(nearly correct or exact)

词根记忆：ap+proxim(接近)+ate--接近的--近似的

例:In 1982 the approximate average cost of operating a subcompact car for 10,000 miles was $3,400.

派生词:approximation(n.近似值)：approximately(ad.近似地，大约)

7.aquarium n.水族馆；养鱼池(artificial pond where live fish and other water creatures are kept)

词根记忆：aqua(水)+rium--水族馆

例:Feeding hours at the aquarium are popular with the children.

8.aquatic a.水的，与水有关的(relating to water）

词根记忆：aqua(水)+tic--水的

例:aquatic animals水生动物

同根词：aaueous(a.水的：似水的)

9.arable a.可耕的（suitable for plowing）

词根记忆：ar(耕种)+able--可耕的

例:arable lands耕地

10.arbitrary a.任意的，主观的(depending on individual discretion）

词根记忆：arbit(判断)+rary--自作判断的--主观的

例:Taxes were irregular in timing and arbdrary inamount.//This intuition is not arbdrary or irrational, but is based on years of painstaking practice.

同根词：arbitrator(n.仲裁人)：arbitration(n.仲裁，公断)