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  There were no speed limits (车速限制) when the first roads were built in the U. S. Then the number of cars grew. It was safer to have all the cars riding at about the same speed. That is why speed limits were made.

  Before 1973, the speed limit on most big roads was 65 miles an hour. Suddenly, the gas supply began to drop. Saving gas became important. One answer was to make a new speed limit of 55 miles an hour.

  Fast speeds use up a lot of gas. The new speed limit has saved about three million gallons (加仑,一种容量单位) of gas a day. It has also saved a lot of lives. About 9000 lives are saved each year. The lower speed gives cars more time to stop.

  Some drivers don't pay attention to the speed limit. Drivers in western states think they should be allowed to drive faster. Their roads are flat (平坦的) and straight. Many truck drivers don't like the new speed limit either. They say their trucks run better at 65 miles an hour.

1.The first roads had no ________ .

[  ]

A.cars
B.signs
C.lights
D.speed limits

2.Before 1973, the speed limit was ________ .

[  ]

A.20 miles an hour
B.55 miles an hour
C.65 miles an hour
D.80 miles an hour

3.A new speed limit of 55 miles an hour was supposed to ________ .

[  ]

A.save gas
B.build roads
C.save time
D.make more cars

4.How many lives have been saved each year since 1973?

[  ]

A.150
B.about 1000
C.about 9000
D.about three million

5.Roads in western states are ________ .

[  ]

A.too wide
B.flat and straight
C.rocky
D.made of dirt
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