题目

抛物线y=2x2﹣2x+1与坐标轴的交点个数是（ ） A．0       B．1       C．2       D．3 答案：C解：抛物线y=2x2﹣2x+1，令x=0，得到y=1，即抛物线与y轴交点为（0，1）； 令y=0，得到2x2﹣2x+1=0，即（x﹣1）2=0， 解得：x1=x2=，即抛物线与x轴交点为（，0）， 则抛物线与坐标轴的交点个数是2，故选C。------Did you attend Professor Johnson’s lecture about the evolution of videos and sound devices?------I wish I __________. I __________ a job interview with the UN.A．had, hadB．had, was havingC．could, have hadD．could have, were having