文件的作用,概括地说就是管理政务的工具和()。
参考答案:手段
When the students heard the good news, they jumped _______ in the classroom. [ ]
A. here and there
B. up and down
C. now and then
D. front and back
In the small zoo, there is a _______ elephant.
A.African
B.Asian
C.Australian
D.European