问题 问答题

(1)如图1所示,请你用笔画线代替导线将开关和螺口灯座连入电路中,使开关能控制灯泡的亮灭.

(2)根据图2所示的电路图,用笔画线代替导线,连接实物电路(要求导线不能交叉)

答案

(1)开关和灯泡是串联的.火线首先接开关,再接灯泡顶端的金属点;零线直接接灯泡螺旋套.

故答案为:

(2)由电路图可知,两灯泡并联,电流表测干路电流,开关S1控制干路,开端S2与灯L2串联,控制灯L2;从电源正极出发,先把开关S1、电流表、灯L2、开关S2串联起来,回到电源负极,然后把灯L1并联在灯L2与开关S2的串联电路两端,电路图如图所示.

故答案为:电路图如图所示.

阅读理解

阅读理解。

     Fashion is moving into the twenty-first century. A coat can change its color with the weather; a shirt

with stripes (条纹) that will disappear while you are wearing it; a blouse can be worn for days and days

without a bad smell... These are not dreams of scientists. They were made possible in the fashion world.

     A jacket changes its color in warm weather and costs between $ 40 and $ 5, 000. Peter White, a designer,

says "There are not much more designers can do with the old cloth. They need to make new kinds of cloth to

keep fashion interesting."

     Massimo Osti is the man who has brought this unusual cloth to the shops. Another of Osti's inventions

has a design of the company's trademark (商标) on the chest, which disappears when you breathe on it. Now

there is a special kind of leisure wear (休闲服) for golfers who like to practice in any kind of weather. As

golfers leave the warm club house, their clothes will change from white to rainbow (彩虹) of colors.

     A Japanese company has developed a man-made fiber (纤维), it can absorb (吸收) sunlight and keep the

wearer up to 10 ℃ warmer than usual fibers. A kind of new cloth for ski-wear can turn black to absorb

sunlight when the temperature drops to below zero, and change to white at above 5 ℃.

      In the Far East and Europe, there are many blouses which have a pleasing smell. The sweet smell lasts

up to three hand-washes.

1. What does the word "Fashion" mean in Chinese?

A. 食物

B. 饮料

C. 时装

2. Massimo Osti is _________.

A. a worker

B. a doctor

C. an inventor

3. When golfers go into the warm house, their special leisure wear will change from _________ to _________.

A. white... colorful

B. colorful... white

C. white... black

4. A man-made fiber can keep the wearer up to _________ warmer than usual one.

A. 10℃

B. 5 ℃

C. 0℃

5. Which of the following is NQT TRUE?

A. New kinds of cloth can keep the fashion world interesting.

B. All kinds of cloth can change their colors when the temperature changes.

C. Many blouses have a sweet smell which lasts up to three hand-washes in Europe.

判断题