题目

The retired couple enjoy_____photos.They always go out with their camerasA. take B. tookC. to take D. taking 答案：【答案】D【解析】试题分析：enjoy doing sth:喜欢做某事。故选D下列运算正确的是 [     ] A.x3·x3=x9B.x3·x3=x6C.x3·x3=2x3D.x3·x2=2x6