（）存在于地下流砂层、石灰层、砾岩层中的水。
A.地下水
B.矿井水
C.老空水
参考答案：A
—Michael has changed beyond recognition.
— ！How did he manage to lose so much weight？
A．So has he
B．Neither has he
C．So he has
D．Neither he has
著作权因作品的( )产生。
A．创作完成
B．登记
C．注册
D．申请
