1.You shouldn’t have 　　　　　(leave) so soon at the party.

2.He is 　　　　　(suppose) to arrive at the station at 8:40.

3. They lay on the beach, 　　　　　(look) up into the blue sky.

4.Eating dumplings at the Spring Festival　　　　　(be) the custom in our country.

5.I was very embarrassed at the party because I 　　　　　(wear) the wrong clothes.

 

The Tin Lizzie

　　It shook, rattled (嗄嗄作响), and groaned (呻吟). It wasn't pretty. It looked like a black box sitting on high, skinny wheels. But it could go anywhere, and it was cheap.

　　What was it? It was Henry Ford's Model-T ca－better known as the Tin Lizzie. This car was the most popular of all for nearly 20 years. It changed the American way of life forever.

　　Model T's were sold as fast as they were made. Eleven thousand were sold in 1908. They cost $850 each. Of course, you can't buy a new car for $850 any longer. The prices of new cars keep changing.

　　The line graph below shows how the average prices of American cars have been changing.

　　A line graph shows how something has changed. This kind of graph uses a simple line to show changes. If the line goes up, that means things have gone up in some way. If the line goes down, then something has gone down.

　　Suppose you want to find the average price of cars for 1977. Find 1977 at the bottom of the graph. Find the dot over the year. Then find the price across from the dot.

　　Use the line graph to answer the questions below.

1．What was the average price of a car in 1979?

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2．What does the line graph show about car prices?

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3．In what year did cars cost more than $4000 but less than $6000?

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4．Suppose you were looking for a new car in 1981. What would the average price have been?

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5．How did the average price of cars change from 1977 to 1979?

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　　How strong is a dollar bill? A dollar bill lasts about a year and a half. By that time, it is usually worn out (磨损) . A$5 bill lasts longer. It is not used as often as a dollar bill. A $ 100 bill lasts longer still.

　　All the bills are made from the same kind of paper. The paper is very strong. You can fold (折叠) a bill about 4000 times before it tears (撕破).

　　Suppose you have a torn bill. You can trade it in at a bank for a whole bill. You must have more than half of the torn bill.

　　The paper used to print money is different from any other paper. This paper has a special pattern (图案). No one can make the same kind of paper. Besides, making the same kind of paper is against the law.

1．A dollar bill lasts about ________ .

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2．Which of the following is TRUE?

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A．A $ 5 bill lasts longer than a dollar bill.

B．You can't fold a dollar bill.

C．You can't tear a dollar bill.

D．A $ 100 bill does not last long.

3．The paper used to make bills is ________ .

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4．How many times can you fold a bill before it tears?

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5．You can trade in a torn bill if you have ________ .

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