设计一个供四人参赛的抢答器，能准确分辨、记录第一个有效按下抢答键者，并用声、光指示；

主持人没有宣布抢答开始时，抢答不起作用。主持人宣布抢答开始时，按“开始”键，抢答开始，同时启动计时器计时；

计时器计时采用倒计数的方式，以加强现场气氛，增加紧迫感。若预定时间内无人抢答，自动给出信号停止抢答，以免冷场。倒计数定时器的时间可以随意预置；

每组有一个计分器。从预置的100分开始，由主持人控制。答对者加10分，答错则扣10分。

-Design a competition for four of the Responder, can accurately identify, record the first valid key pressed to answer in person, and use sound, light direction　hosts did not announce to answer in the beginning, to answer in does not work. When the host announced the answer in the beginning, click " Start"　button, to answer in the beginning, and start the timer time　timer countdown timer with a way to enhance the atmosphere, increasing the sense of urgency. If no answer in his place within the scheduled time, automatically gives the signal to stop to answer in order to avoid the cold field. Countdown timer time can be arbitrarily preset　each has a scoring device. The 100 points from the pre-start controlled by the moderator. Correct answers were added 10 points, got it wrong then deducted 10 points.