化学元素在岩石圈中存在的基本单元是[ ]
A、矿物
B、矿产
C、矿石
D、岩石
答案:A
Compared with last year, our pay about ¥500 every month. [ ]
A. has increased by
B. has increased
C. increased by
D. increased to
全球通268元套餐包本地主叫.省内主叫.省际主叫()分钟。
A.950
B.1000
C.1050
D.1100