Many years ago when people had no thermometers (温度计), they usually touched a thing to see how
hot or cold it wasThe following experiment shows how easy it was to make a mistake. 
     Take three glasses: the first one with very hot water. The second one with very cold water, and the third
one with water at room temperature. Then you put a finger of one hand in the hot water, and a finger of the
other hand in the cold water. You hold your fingers in the two glasses for a minute. Then you use each finger,
one after another, to see how hot or cold the water in the third glass is. You will find that the water is warm to
the finger that was in the cold water before, but the finger which was in the hot water will feel cold in the
same glass of water. 
     That is why you must always find the temperature in a scientific way. You must not try to tell the
temperature as it seems to you.
     You will often make a mistake if you take something that seems to you for a real fact. For example, when
you are going to an Amusement park by bus and you want to get there very quickly, it seems to you that your
bus is going very slowly, slower than the other buses. But if it is Sunday and you have much free time, it
seems to you all the buses and cars are going very fast.

1. The experiment tells us that sometimes it is ______ to make a mistake.

A. interesting
B. difficult
C. easy
D. helpful

2. The water in the third glass is ______.

A. colder than the water in the first glass
B. hotter than the water in the first glass
C. colder than the water in the second glass
D. as cold as the water in the second glass

3. What will you find if you put the finger which was in the first glass into the second glass according to
    the experiment?

A. The water is hotter than it is in the first glass.
B. The water is as hot as it is in the first glass.
C. The water is at room temperature.
D. The water is colder than it is in the first glass.

4. How should we find the temperature according to the passage?

A. Try to tell as it seems to us.
B. Try to use our fingers.
C. Try to tell in a scientific way.
D. Try to touch something to see how hot it is.

5. We can learn something about ______ from the passage.

A. physics
B. chemistry
C. psychology (心理学)
D. biology

      A frog (青蛙) sat in a well. A bird flew down and fell on the wall of the well (井).
      The frog asked the bird, "Where are you from?"
      "I fly in the sky. I have flown over one hundred Li. I feel thirsty. So I come down for water,"
answered the bird.
      The frog said, "My friend, don't talk big. The sky is just as big as the mouth of the well. Won't
you have to fly so far?"
      The bird said, "You are wrong. The sky is boundless (无边无际的). It is much bigger indeed."
      The frog laughed and said, "My dear, I sit in the well every day. When I look up, I will see the sky.
I won't be wrong."
      The bird laughed, too, and said, "My good friend, you make a mistake. If you don't believe me,
you jump out of the well and have a look at it."

1. Where was the frog?

A. In a river
B. In a well
C. In the field
D. On the wall of the well

2. Where was the bird from?

A. From a tree
B. From a well
C. From the sky
D. The story doesn't tell us

3. The bird came down into the well for ______.

A. food
B. seeing the frog
C. swimming
D. water

4. The frog thought the sky was ______.

A. boundless
B. very big
C. very nice
D. very small

5. Who was right?

A. Both of them
B. Neither of them
C. The bird
D. The frog

     Many years ago when people had no thermometers (温度计), they usually touched a thing to see
how hot or cold it was. The following experiment shows how easy it was to make a mistake (错误).
     Take three glasses: the first one with hot water, the second one with very cold water and the third
one with water at room temperature. Then you put a finger of one hand in the hot water, and a finger
of the other hand in the cold water. You hold your fingers in the two glasses for a minute. Then you use
the two fingers, one after another, to see how hot or cold the water in the third glass is. You will find that
the water is warm to the finger that was in the cold water before, but the finger which was in the hot water will feel cold in the third glass of water.
     You will often make a mistake if you take something that seems to you for a real fact. That is why
you must always find the temperature in a scientific way. You must not try to tell the temperature as it
seems (好像) to you.

1. The experiment tells us that sometimes it is _____ to make a mistake.

A. interesting   
B. difficult   
C. easy   
D. helpful

2. The water in the third glass is _____.

A. colder than the water in the first glass
B. hotter than the water in the first glass
C. colder than the water in the second glass
D. as cold as the water in the second glass

3. What will you find if you put the finger which was in the first glass into the second glass according
 to (根据) the experiment?

A. The water is hotter than it is in the first glass. 
B. The water is as hot as it is in the first glass.
C. The water is at the room temperature.
D. The water is colder than it is in the first glass.

4. How should we find the temperature according to (根据) the passage? 

A. Try to tell as it seems to us.
B. Try to use our fingers.
C. Try to tell in a scientific way.
D. Try to touch something to see how hot it is.

5. You will often make a mistake if you take something that _____.

A. seems to you for a real fact 
B. is a real fact
C. finds in a scientific way 
D. uses by your own hands

A. must
B. may
C. should
D. has to