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The summer of 1988 was the driest in Yellowstone National Park's recorded history.The dried grasses and leaves in the forest of western Wyoming had set the stage of a fierce fire.All that was needed was a trigger.
A few small fires started in June.By August and September，lightning set some fires，and careless people set others.Soon fires swept across the park.The heat of the fire made winds stronger.Fierce winds blew flames from place to place.Animals raced for their lives.
More than 25，000 people worked to fight the fire，but they made little impact.Rain and snow finally began to fall，and weeks later，the fire was over.Vast areas of the park were burned.Many people thought the forest had been lost Most did not expect it to regrow，soon.
Fire plays a key role in the park's ecosystem.According to a forest manager，when a fire approached，the animals ran away to an open area.Then many of them headed right back into the burned areas.
It turns out that fire is not all bad in the park.In fact，many living things have adaptations that allow them to survive and even grow stronger after a fire!For example，lodgepole pines make up nearly 80% of the park's forest.They are adapted to reproduce after a fire.The mineral soil left from the fire improved conditions for them to grow stronger.
Park scientists learned from past fires.For years，most park managers believed they had to put out all fires to save park resources.But scientists learned that stopping all fires reduces the number of plant and animal species.In 1972，Yellowstone managers began allowing most fires to burn if they were started naturally.They still fought human-caused fires and protected homes and towns from fires.The 1988 fires helped scientists learn more ways to manage fires.
（1）What does the underlined "trigger" in paragraph 1 probably mean？ DD
A．heat
B．stage
C．measure
D．cause
（2）Yellowstone fire in 1988 was finally stopped by AA.
A．The weather.
B．The animals.
C．The fire fighters.
D．The ecosystem.
（3）Which of the following was the result of Yellowstone fire in 1988？ BB
A．Animal extinction.
B．Reproduction of plants.
C．Animal habitat destruction.
D．Disappearance of the forest.
（4）How do the park managers control the forest fires now？ BB
A．They put out all the fires.
B．They prevent fires set by men.
C．They reduce naturally-lit fires.
D．They let fires burn far from home.
【答案】D；A；B；B
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發(fā)布：2024/5/27 14:0:0組卷：1引用：1難度：0.4
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