若|x|=﹣x,则x是[ ]
A.正数
B.负数
C.负数或零
D.正数或零
答案:C
什么是整式?______,整式中如有分母,分母______(含、不含)字母.
We have some houses. But we need _____ .[ ]
A. more many
B. another many
C. many another
D. many more