填空题 从供选择的答案中选出应填入英语文句中()的正确的答案。
The computer itself does not do all the work on its own. The work is done by a

• (A) of the computer, called hardware, and
• (B) of instructions, called software or computer programs. Inside the machine, the instructions are
• (C) and carried out to do the work you want to do A computer without software is nothing more than a mass of metal and plastic On the other hand, software without a computer is simply wasted
• (D) because only the computer can use the software and put it to work .When you talk about a computer's being able to do this or that, you are really referring to the
• (E) that accepts your commands and the computer that carries them out.
  A: ① memory ② chip ③ combination ④ wire
  B: ① programs ② procedures ③ sets ④ subroutines
  C: ① composed ② explained ③ interpreted ④ organized
  D: ① disk ② file ③ tape ④ potential
  E: ① editor ② hardware ③ keyboard ④ software