题目

My pen-friend, Peter, wrote to me, expressing the hope       he would come to Beijing to see the 2008 Olympics Games. YCY        A．that   B．which       C．what  D．whether 答案：A经过点P（2，-3）作圆（x+1）2+y2=25的弦AB，使点P为弦AB的中点，则弦AB所在直线方程为（ ）A．x-y-5=0B．x-y+5=0C．x+y+5=0D．x+y-5=0