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 3.Someone must have left the door open by m________.

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完形填空

   David is a middle school student. He had lived in a small village 1fifteen years. It was a small place with only five families living there. His father, Mr. Hill, was a rich farmer and later on he 2 a shop in our town. He bought a house here last month. His 3 moved to the new house and his son began tostudy in our class. But he had 4 friends here. At first he often played by 5

His neighbor Cathy is a kind girl. She has many friends. She finds the boy never talks with anybody and decides to help him. David 6to stay with her and talks to her a lot. Now they're good friends.

One afternoon, Cathy told David, "It'll be my sixteenth birthday tomorrow. I'll have a birthday party. Would you like to come?"

"  7  . I'm glad to," the boy said happily.

   David got home and thought of a 8he could give to Cathy. He was sorry that he 9 to ask the girl what she liked. He couldn't telephone her because he didn't know her 10 . At that moment Mrs. Hill came and asked, "What's the matter, dear?"

   "What would you like if it was your sixteenth birthday, Mom?"

    "Nothing, " the woman said, "I just wish I were sixteen."

(       )1. A. at                   B. in

      C. for                    D. of

(       )2. A. showed                  B. studied

      C. opened                   D. taught

(       )3. A. home                  B. shop

      C. building                D. family

(       )4. A. a few                B. few

      C. a little               D. little

(       )5. A. himself               B. myself

      C. yourself            D. itself

(       )6. A. needs                B. enjoys

      C. asks                  D. likes

(       )7. A. Well                 B. No

      C. Sorry                  D. Yes

(       )8. A. book                 B. dress

      C. gift                    D. pen

(       )9. A. forgot                 B. tried

     C. memorized                 D. remembered

(       )10. A. home               B. number

      C. place                D. address

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(2014 厦门) It seems very natural that if you have two dollars and add two dollars to them, you have four dollars. But do you know it took man millions of years to be able to think this way? In fact , one of the most difficult things to teach children is the idea of numbers.

    In ancient times , when a man wanted to tell how many animals he owned, he had no system(体系)of numbers to use. He put a stone or pebble into a bag for each animal. The more animals,the more stones or pebbles he had. It may explain why the word “calculate” comes from the Latin word “calculus” which means “stone”.

    Later on , man used tally marks to count. People would just scratch(划下)a line or tally mark for each object they wanted to count, but they had no word to tell the number.

    The next step in the development of the number system was probably to use fingers. Again we have word that goes back to this. The word “digit” comes form the Latin word “digitus”. It means “finger”! And the fact that we have 10 fingers led to the general use of 10 in the system of numbers.

    The number system we use today was invented by the Hindus in India thousands of the years ago and was brought to Europe during 8th to 11th century by Arab traders. In this system all numbers are written with the nine digits 1,2,3,4,5,6,7,8,9 and zero. It is decimal system(十进制), that is, it is built on the base of 10.

1. Man first used ______ for counting.

  A.a line or tally mark      B. a stone or pebble      C. fingers

2. If A and B each scratched three lines for their own objects to be counted, they      would probably have ______ objects in all.

   A. three          B. six              C. nine

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  A. calculus and stone      

  B. digitus and finger          

  C. calculus and digitus

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  A. The Hindus in India     B. Europeans      C. Arab traders

5. There are ________ steps in the development of the counting system.

  A. two          B. four             C. five

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