阿司匹林中能引起过敏反应的杂质是

A．醋酸苯酯

B．水杨酸

C．乙酰水杨酸酐

D．乙酰水杨酸苯酯

E．水杨酸苯酯

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