题目

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。How to Introduce Yourself Before Giving a Speech Greet the audience and state your name. If you're giving a speech, it's important to state your first and last name.Don't state down or at some aimless point in the corner of the room. If you don't like the thought of looking into that many eyes, look at their eyebrows or noses—they won't be able to tell the difference. Share some relevant（相关的）information about yourself. After you provide your name, share why you17．图中的开关叫做单刀双掷开关，当把闸刀向左边按下时，a、b两个接线是连通的，a、c之间是断开的；当把闸刀向右边按下时，a、c两个接线柱是接通的，a、b之间是断开的．现在请你用这个闸刀来控制红灯和绿灯，使闸刀向右边按下时红灯亮绿灯熄，向左边按下时绿灯亮红灯熄，画出导线的连接图．