They ____well.
Old bottles or newspapers are also useful, so don't ___________.
已知 f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)则 f'1 ____.
利用互联网可以方便的进行一些信息的传递,下列各种方式中,不能通过互联网做到的是( )