1、The constitution's vague nature has given it the flexibility to be adapted when circumstances change.

　　A.imprecise　　B.apparent　　C.clear　　D.easy

　　2、An important part of the national government is the Foreign Service, a branch of the department of state.

　　A.tree　　B.division　　C.root　　D.leaf

　　3、The city has decided to do away with all the old buildings in its center.

　　A.get rid of　　B.set up　　C.repair　　D.paint

　参考答案&解析：

　　1、A　vague模糊的;imprecise不确切的，不明确的。这两个词意思相近。apparent清楚的。It is apparent that we have made a mistake.显然，我们犯了个错误。clear是“清楚的”，easy是“容易的”。

　　2、B　branch分支机构，枝。division也有分支机构的意义。tree树;root根;leaf叶。

　　3、A　do away with “去掉，废除”;set up “建立”，repair“修理”，paint “油漆，描绘”，都与“去掉”无关，所以只有get rid of是答案。