细胞生长是生物体能够由小长大的唯一原因．
——Where do you often exercise?——I often exercise in a park. It's close to my house.
—What do you usually do with your brother?
—I usually ____ with my brother.
已知fx=3-ax-32,x<1logax,x≥1是-∞,+∞上的增函数，则实数a的取值范围是（ ）
