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　　Ancient numbers

　　In ancient 　　1　　, people wrote numbers in many different 　　2　　, 　　3　　 these pictures of the number 6 show．　　4　　, they nearly all counted in the same way－in 　　5　　．

　　Zero

　　The system of numbers that nearly everyone uses today 　　6　　 of the numbers from 1 to 9 and 0 　　7　　 these ten numbers, we can write any number from the biggest to the smallest．The Indians 　　8　　 invented and developed the 1 to 9 system of numbers．They then invented the zero．This was a very important 　　9　　 because it made it easier to write big numbers and to 　　10　　．

　　Calculating machines

　　One of the first calculating machines was an 　　11　　．Abacuses are so fast and accurate that people still use them today．On the abacus in the picture, the beads on the wires 　　12　　 ones, tens, hundreds and thousands, starting from the 　　13　　 wire．

　　The picture on the right shows a modern electronic calculator．It can add, subtract, multiply and divide．It can also calculate percentages and 　　14　　 roots．

　　This picture shows a computer．Computers are very 　　15　　 calculating machines．In a flash, a computer can do a calculation that you could not do in your whole lifetime．

　　Brain against computer

　　Some people call the brain a 　　16　　 computer．Is a human brain a more powerful 　　17　　 than a computer? The following story may give you an answer．

　　Shakuntala Devi is a lady from India with an 　　18　　 brain．She can calculate like lightning．In America, Shakuntala and a very powerful computer were given this problem to solve．

　　Shakuntala's brain took fifty seconds to find the answer．The computer took a minute．However, before the computer could begin 　　19　　, someone had to program it with instructions, and that took many hours．No one had to 　　20　　 Shakuntala!

1．________　2．________　3．________　4．________　5．________

6．________　7．________　8．________　9．________　10．________

11．________　12．________　13．________　14．________　15．________

16．________　17．________　18．________　19．________　20．________

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判断正(T)误(F)。

    One afternoon some boys made a lot of noise in class. The teacher got angry. He kept them in the
classroom after school. He told them to add all the numbers from 1 to 100 together.
    The boys took out their exercise-books. All of them began to write the numbers down except one
boy. He was new in the school. He looked out of the window for a few minutes. Then he wrote a
number in his exercise-book and put up his hand.
    "May I go home, sir?" he asked. "I know the answer now."
    The teacher and the other boys were very surprised.
    "Bring it here." said the teacher.
    The next morning, the teacher asked the boy. "How did you find the answer so quickly?"
    "Well,sir." He said, "I did not want to stay here so long. So I did my best to find the answer quickly.
Soon I found it. You see, if you add 100 to 1, you get 101, and 99 and 2 is 101, 98 and 3 is 101 too,
and when you reach 51 and 50, you have 101 fifty times, that is 5050".
    After this, when the teacher gave the class exercises to do, he gave this boy different exercise. The
boy's name was Karl F.Gauss. When he grew up, he became a great scientist.

(     )1. Little Gauss was a new student in that school.
(     )2. Little Gauss and his classmates always listened to their teachers very carefully in class.
(     )3. All the boys wrote the numbers from 1 to 100 down and added them up.
(     )4. Little Gauss left the classroom much earlier than the other boys.
(     )5. Little Gauss told the teacher how he found the answers so quickly the next day.

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This story is about a young man. He worked hard at his lessons. He was too busy. He didn’t have time to rest, so he was ill. Every night, when he went to bed, he closed his eyes and tried to sleep（睡觉）. But he couldn't. He thought: “I must go to see the doctor.” He said to the doctor. “I can't go to sleep at night.” “Try counting numbers. When you reach one thousand, you'll be asleep.” The next day the man came back to the doctor's office. “Well,” said the doctor, “How are you today?”

“Yes, he said,” I tried counting one, two, three. . . up to （直到）one thousand. But when I reached five hundred and sixty-nine, I began to feel sleepy (感到困倦). I had to get up and drank some tea. Then I went on counting up to one thousand. But I still couldn't fall asleep.

1.The young man couldn’t go to sleep because ________ .

A．he didn't finish his lessons

B．he worked too hard and was ill

C．he was worried about his homework

D．there was a lot of housework to do and he couldn't have a good rest

2.The doctor asked the young man ________ .

A．to count numbers before he went to bed

B．to put all numbers from 1 to 1000 together

C．to count numbers while he was lying in bed

D．to go to bed earlier

3. The young man came back to the doctor's office the next day because ___ .

A．he wanted to thank the doctor

B．he was better

C．he wanted to ask the doctor how to count the numbers

D．he still couldn't go to sleep at night

4.The young man ________ .

A．counted from 569 to 1000

B．counted from 1 to 569 and fell asleep

C．counted from 1 to 569 and got up to drink some tea

D．counted from 1 to 1000 and fell asleep

5.The young man ________ in fact.

A．didn't understand the doctor's words.	B．couldn't count numbers
C．didn't try to sleep	D．wasn't ill at all

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This story is about a young man. He worked hard at his lessons. He was too busy. He didn’t have time to rest, so he was ill. Every night, when he went to bed, he closed his eyes and tried to sleep（睡觉）. But he couldn’t. He thought: “I must go to see the doctor.” He said to the doctor. “I can’t go to sleep at night.” “Try counting numbers. When you reach one thousand, you’ll be asleep.” The next day the man came back to the doctor’s office. “Well,” said the doctor, “How are you today?”
“Yes, he said,” I tried counting one, two, three. . . up to （直到）one thousand. But when I reached five hundred and sixty-nine, I began to feel sleepy (感到困倦). I had to get up and drank some tea. Then I went on counting up to one thousand. But I still couldn’t fall asleep.
【小题1】The young man couldn’t go to sleep because ________ .

A．he didn’t finish his lessons

B．he worked too hard and was ill

C．he was worried about his homework

D．there was a lot of housework to do and he couldn’t have a good rest

【小题2】The doctor asked the young man ________ .

A．to count numbers before he went to bed

B．to put all numbers from 1 to 1000 together

C．to count numbers while he was lying in bed

D．to go to bed earlier

【小题3】 The young man came back to the doctor’s office the next day because ___ .

A．he wanted to thank the doctor

B．he was better

C．he wanted to ask the doctor how to count the numbers

D．he still couldn’t go to sleep at night

【小题4】The young man ________ .

A．counted from 569 to 1000

B．counted from 1 to 569 and fell asleep

C．counted from 1 to 569 and got up to drink some tea

D．counted from 1 to 1000 and fell asleep

【小题5】The young man ________ in fact.

A．didn’t understand the doctor’s words.	B．couldn’t count numbers
C．didn’t try to sleep	D．wasn’t ill at all

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根据下面一篇短文的内容判断下列句子的正误，正确的用“A”来表示，错误的用“B”来表示。

A young man couldn’t sleep well every night. He was very worried. One day he went to see the doctor. The doctor looked him over carefully. But nothing was wrong with him. The doctor told him to count from 1 to 10 again and again. “Keep doing it until you fall asleep,” the doctor said.

After a few days, the young man came to the doctor again. But to his surprise, the doctor found the young man was even worse than before! “Didn’t you count as I told you?” the doctor asked. “Yes, I did,” the young man answered. “But every time when I reached eight, I couldn’t help jumping(跳) from bed.”

“But why?” the doctor wanted to know. The young man said, “I am a boxer.”(拳击运动员)

1.The young man had a very terrible illness(疾病).

2.The doctor told him to count numbers from 1 to 1000 .

3.After a few days the young man was even worse.

4.The young man didn’t do the things that the doctor told him.

5.The young man was a boxer.

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