质押合同自( )生效。
A．质权人取得质物所有权时
B．质物脱离所有权人控制时
C．质物移交与质权人占有时
D．出质人交付质物时
参考答案：C
蝼蛄lïu gū
A wildlife preserve is being planned for 3,000 rhinoceroses. The preserve is to contain a total of 10,000 acres of watering area, plus 100 acres of grazing area for each rhinoceros. If the number of rhinoceroses is expected to increase by 10 percent, how many thousand acres should the preserve have in order to provide for the increased population ？（）
A.340
B.330
C.320
D.310
E.300
