由于黏土颗粒层面上存在电动电势，所以层而间相互（）。
A.吸引
B.聚结
C.排斥
D.分散
参考答案：C
—It’s really a surprise th at the manager should have no idea about the plan.
—Of course he doesn’t, for the plan was made in his .
A．shortage
B．analysis
C．absence
D．presence
