下列各点中,在x轴上的是 [ ]
A.(3,-3)
B.(0,3)
C.(-3,0)
D.(3,-4)
答案:C
Uncle _____ exercises.
It's not good for his health. [ ]
A. sometimes
B. seldom
C. often
D. always
编次与整列历史事实应该大体遵循如下基本的原则与常用的方法()
A.以时间为基本线索
B.应该注意空间观念
C.应遵循系统性、完整性原则
D.运用科学的分类方法,依据内容的性质,分门别类地编次与整列历史事实