疟疾引起的脾脏病变最具特征的是（）
A.脾肿大
B.脾窦高度充血
C.脾窦内有含疟原虫的红细胞
D.脾小体缩小
E.脾髓纤维化
参考答案：C
按照股指期货投资者适当性制度的要求，一般法人投资者的指定下单人、结算单确认人、资金调拨人等应当参与知识测试。（）
He made another wonderful discovery, _______________ of great importance to science.
A．which I think is
B．which I think it is
C．which I think it
D．I think which is
