题目

—Mom, I can't find my English books.—They're in your________. A . room B . family C . card D . photo 答案：A若（1+2x）（1﹣2x）7=a0+a1x+a2x2+…+a8x8 ， 则a0+a1+a2+…+a7的值为（ ）A.﹣2B.﹣3C.253D.126