问题 选择题

刻度均匀,但读数不准的温度计,在冰水混合物中的示数为4℃,在一个标准大气压下的沸水中示数为94℃,用此温度计测某液体的温度是31℃,则这杯液体的实际温度是

A.36℃

B.26℃

C.30℃

D.32℃

答案

答案:C

题目分析:1标准大气压下水的沸点为100℃,冰水混合物的温度为0℃,100℃和0℃之间有100等份,每一份代表1℃;而题目中温度计测量冰水混合物体的温度是4℃,1标准大气压沸水的温度是94℃,中间是90个小格,首先求出一个小格表示的温度;用它测得某液体的温度为31℃时,距离4℃有27个小格,求出27个小格表示的温度加上温度计显示为4℃时的实际温度0℃,就是液体的实际温度.

(1)温度计一个小格表示的温度等于

(2)用它测得某液体的温度为31℃时,液体的实际温度×(31-4)+0℃=30℃.

点评:对于温度计不准的读数问题,我们要先求出温度计一小格表示的温度,然后乘以温度计的水银柱相对于0℃上升了多少格,求出物体的实际温度.

填空题
阅读理解

Have you ever seen people dance? Some dances are fast and others are slow. People’s feet always move when they dance. They keep on moving until the music stops.

People have enjoyed dancing for a very long time. This story is of a different kind of dance. It is a dance without people or music. Yet this dance is one of the oldest in the world. It is the dance of bees.

If you have ever watched bees, you know that they are very clever. They also work hard looking for food and bringing it back to their home.

The home of the bees is called a bee hive. Here hundreds even thousand of bees live. They work day and night building small walls. There they make their honey. This is the same honey that we eat.

Where does the honey come from? Bees live on food from flowers. Have you seen bees flying around a flower garden? When a bee rests on a flower, it tries to go to the centre of it. There it takes in as much food as its body can hold. Then it flies to take the food back to the hive.

At the hive, bees change flower food into honey. Then they fly away for more food.

How do the bees know where to find the best food in the sweetest flowers? One bee acts as a guide. When it discovers good flowers, it flies back to the hive and tells the others. It does this by dancing for them.

The bee dances on one side. This tells the other bees which way to go to find the flowers. But that is not all. The bee dances for some time. And the length of its dance tells the other bees how far they must fly to reach the flowers.

When the bees see the dance, they know where the flowers are. They fly away and return with more food for the hive.

Sometimes we hear the music of the bees as they fly around. But few people have ever seen them dance. Yet without that dance we might never have sweet honey to eat.

1. The writer believes that_________.

A. people dance better than bees

B. people learned dance from bees

C. bees dance more often than people

D. bees don’t like music

2. From this passage we know that the dance of bees means_______.

A. They are good at dancing

B. they want to show their beauty

C. they communicate with each other

D. they have nothing to do

3. Which of the following is true?

A. People get honey from flowers directly.

B. People draw honey from bees’ bodies.

C. People produce honey in a secret place.

D. People get honey from bees indirectly.

4. What character do bees have?

A. dance-loving           B. hard-working        C. music-loving        D. active