小明利用热敏电阻设计了一个“过热自动报警电路”，如图甲所示．将热敏电阻R安装在需要探测温度的地方，当环境温度正常时，继电器的上触点接触，下触点分离，指示灯亮；当环境温度超过某一值时，继电器的下触点接触，上触点分离，警铃响．图甲中继电器的供电电压U₁=3V，继电器线圈用漆包线绕成，其电阻R₀为30Ω．当线圈中的电流大于等于50mA时，继电器的衔铁将被吸合，警铃响．图乙是热敏电阻的阻值随温度变化的图象．

下列成语运用正确的一项是（   ）。

下图所示为中国近代前期先后出现的两种工厂组织结构简图，从图一到图二的变化说明近代工厂(　　)

   When you write a letter or make a telephone call, your words 1a message. People communicate(沟通) with words. Do you think you can communicate2words? A smile3your face shows you are happy and friendly. Tears in your eyes tell 4that you are sad. When you 5your hand in class, the teacher knows you want to say something6ask questions. You shake（摇头） your head, and people know you are saying no. You nod（点头） and people know you are saying7.
   Other things can also give some information. For example, a sign at the bus stop helps you to know which bus  8. A sign on the wall of your school helps you to find the library. Signs on doors tell you  9to go in or out.10you ever noticed that there are a lot of signs around you and that you receive message11them all the time?
   People can communicate12many other ways.13artist can use his drawings to tell about beautiful mountains, about the blue sea and many other things. Books14 to tell you about all wonderful things in the world. They all help us to know 15 is going on in the world.