明中期,国家修筑长城的直接目的是[ ]
A.防止蒙古骑兵南下
B.巩固北部边防
C.维护边境安定
D.阻绝边境走私贸易
答案:C
Windows基本操作题,不限制操作的方式注意:下面出现的所有文件都必须保存在考生文件夹下。本题型共有5小题。
My daughter insists ______in this school.
A.that she would not study
B.studying not
C.that she not study
D.not to study