题目

With their son ______a foreign college now, the parents have some financial problems mow and then.A. to attend          B. attending          C. attended          D. having attended 答案：B（2008?深圳）关于人体的新陈代谢，下列说法正确的是（　　）A．唾液淀粉酶能消化蛋白质B．紧急情况下，可以给A型血病人输B型血C．肺是人体气体交换的场所D．人体肺动脉里流的是动脉血