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

答案及解析：

1. A。vague模糊的；imprecise不確切的，不明確的。這兩個(gè)詞意思相近。apparent清楚的。It is apparent that we have made a mistake. 顯然，我們犯了個(gè)錯(cuò)誤。clear是“清楚的”，easy是“容易的”。

2. B。branch分支機(jī)構(gòu)，枝。division也有分支機(jī)構(gòu)的意義。tree樹；root根；leaf葉。

3. A。do away with “去掉，廢除”；set up “建立”，repair“修理”，paint “油漆，描繪”，都與“去掉”無關(guān)，所以只有g(shù)et rid of是答案