水钻井液是由粘土、水和各种处理剂及加重材料组成的（）。
A.溶液
B.悬浮体
C.溶胶
D.溶胶与悬浮体
参考答案：D
联系实际论述如何运用效率增进原理做好公安工作。
My niece has three brothers, all ( ) than she. ( ), John, is an oil worker.
A．older; The oldest
B．older; The eldest
C．elder; The oldest
D．elder; The old one
