A:540个
B:8100个
C:17280个
D:7560个
— How does Jane go to school?
— She ______ride a bike to school, but now she ______going there by bus.
形近字组词
探____ 昌____ 阁____ 宴____
深____ 冒____ 间____ 安____
设f(x)是定义在R上的偶函数,当x≤0时,f(x)=2x2﹣x,则f(1)=____