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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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根据短文内容选词填空。(Choose the right words to fill in the blanks．)
Damage to the ozone layer
The writers tell us that‘ozone is a gas 1 occurs 20－50 km above the ground．It forms an essential protective layer around the earth． 2 it, the sun would burn us up．’
We are making holes in the ozone layer mainly by using chemicals 3 CFCs．We use these in fridges and spray cans, and to make plastic items such as fast food boxes．
Destruction of the rain forests
The burning and cutting down of trees is making the Greenhouse Effect 4 because trees take in CO2．It also causes erosion of the soil and flooding, as 5 as destroying the people and animals who make the forests their home．
Bad habits
Many of our habits cause pollution, especially our habit of using things 6 and then throwing them away．This creates massive mountains of rubbish．We don't know 7 to do with the rubbish and it pollutes our land and sea．For example, seven billion drink cans are thrown away in Britain each year．That is 8 to reach from the earth to the moon．
How can we save the earth?
This book's idea is that we should become 9 consumers．That is, we should only buy and use things that do not damage the environment．And we should buy only from companies 10 do not damage the environment either．
1．________ 2．________ 3．________ 4．________ 5．________
6．________ 7．________ 8．________ 9．________ 10．________
综合填空：
What do you usually use mobile phones for?Sending text messages for fun?Playing games?Well, mobile phone can do f 1 more than that．D 2 this year’s Asian tsunami(海啸)，mobile phones saved many l 3 ．More than 10000 international phones were w 4 when the tsunami hit．Police sent text messages to them and found more than 2000．But how?People f 5 the signal and found out w 6 the tourists were．So, how can s 7 so small be so smart?Well, here’s how!When you turn the phone on, it tries to find a signal．This signal．This signal comes from the telephone network．
If you have a signal you can see it on the phone’s screen．Sometimes, if the signal is weak, i 8 can be difficult to make a phone call．When the phone is finding a signal, it also sends a m 9 to the telephone network．This message tells the station where the phone is．When you start to make a phone call, the telephone network tells telecommunication offices where you are．The office will find out who you’re calling then put you t 10 to your friend!