32._________on the lonely island_________more difficult than they had expected.

A．Survivor…proved

B．Surviving…proved

C．Survival…was proved

D．To survive…proves

急性脑血栓形成患者，用低分子右旋糖酐的目的是

A．抗凝治疗
B．血液稀释
C．早期溶栓
D．降解纤维蛋白
E．清除自由基