80. 最后，他們決定步行穿過森林。

At last,they   the forest.

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   They make people scream in fear,yet people pay for a chance to ride them. What are they? They are roller coasters,of course.

   Hundreds of roller coasters make people excited at theme parks around the country. The first roller coaster in the United States was a train. People built it in 1800 in order to carry coal (煤) down a mountain. When it was no longer used as a coal train,it began a new life as an amusement (娛樂) ride. It went 18 miles downhill at a speed of 6 miles per hour. The entire ride lasted almost three hours.

   Modern coaster tracks (軌道) are measured (計量) in feet rather than miles. The rides last minutes instead of hours,but they are far more exciting. Some reach a speed of 100 miles per hour.

   People started building real roller coasters in the 1880s. Some gave such a wild ride that people often got hurt on them. Today's roller coasters are not dangerous. Safety bars and harnesses hold riders in place. In addition,workers spend four hours each day checking the coasters. In some parks,computers monitor (監(jiān)控) the coasters throughout each ride.

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Roller coasters in America

What they are

They make people scream in(1) , but people still like riding them.

The first roller coaster

•          It was first used as a{2) train.

•     It moved at a speed of 6 miles per(3)   and the ride lasted almost(4) hours.

Modern roller coasters

•          They started in the late 19th(5)

•          The tracks were much(6) and   the rides took(7) time   than heW

•     They are far more (8). At first, some were quite (9) because   of high speeds. But today, they are (10) than   before because of narefnl nbpnVing and monitoring each   day.

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