题目

—The authors of computer viruses are geniuses. —I agree. If they applied their wisdom to other net technology ________ human beings can benefit，it would be better. A．in which           B．through which C．from which         D．during which 答案：C benefit from通过……获利。因此选择C项。   一小孩不小心摔倒擦伤了皮肤，当伤口的血液凝固后，在血块的周围出现的淡黄色、透明的液体，下列说法正确的是（　　）A．液体是血浆B．液体是血清C．液体是血小板D．液体不含有纤维蛋白