美国政府对不同GPS用户提供()定位服务和精密定位服务。
参考答案:标准
日前世界上石油储量最大,生产和输出石油最多地区是
A.东南亚
B.中亚.
C.欧洲西部
D.西亚
The teacher ________ my mobile phone because I used it in class. [ ]
A. took out
B. took away
C. took off
D. took place