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

问题：

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。

     Before going outside in the morning, many of us check a window thermometer (温度计) for the

temperature. This helps us decide what to wear. 1_____. We want our food to be a certain coldness

in the refrigerator. We want it a certain hotness in the oven. If we don't feel well, we use a thermometer

to see if we have a fever. We keep our rooms a certain warmth in the winter and a certain coolness in

the summer.

     Not all the thermometers use the same system to measure temperature. We use a system called the

Fahrenheit scale. But most other countries use the Centigrade scale. Both systems use the freezing and

boiling points of water as their guide. 2_____.

     The most common kind of thermometer is made with mercury (水银) inside a clear glass tube. As

mercury (or any other liquid ) becomes hot, it expands. As it gets colder, it contracts (收缩). That is

why on hot days the mercury line is high in the glass tube. 3_____.

     First. Take a clear glass juice bottle that has a cap; fill the bottle with coloured water. Tap a hole in

the center of the cap using a hammer and thick nail. Put the cap on the jar. Then stick a plastic straw

(吸管) through the nail hole. 4_____.

     Finally. Place a white card on the outside of the bottle and behind the straw. Now you can see the

water lever easily. 5_____.

     As the temperature goes down, the water will contract, and the lever in the straw will come down.

Perhaps you will want to keep a record of the water lever in the straw each morning for a week.

A. We use and depend on thermometers to measure the temperature of many other things in our daily

     lives.

B. Thermometers measure temperature, by using materials that change in the same way when they are

     heated or cooled.

C. Now that you know this rule you can make a thermometer of your own that will work.

D. The water will rise in the straw. As the temperature of the air goes up, the water will expand and rise

     even higher.

E. They label these in different ways. On the Fahrenheit scale water freezes at 32 degrees and boils at 212

     degrees. On the Celsius scale water freezes at 0 degrees and boils at 100degrees.

F. Take wax (you may use an old candle if you have one) and melt some of it right where the straw is

     struck into the cap to seal (把..粘住) them together.

G. People use thermometers which are made by themselves when travelling around the world.