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题型:阅读理解-阅读单选 难度:0.65 引用次数:220 题号:16157145

Alaska’s Yukon River has faced major salmon shortages in recent years. Officials say record-high temperatures last year killed most salmon in the 3,200-kilometer river before the fish were able to reproduce. The losses led Alaska to stop their salmon harvests in 2021 to make sure that enough fish survived to reproduce for another year.

The poor salmon harvests caused major financial losses to private fishing companies in the area. The die-offs also hurt native communities, which traditionally store the fish as a year-round food supply.

Last month, the U.S. Department of Commerce declared a disaster for Yukon River fishing for 2020 and 2021, making aid money available. Alaska has sent emergency fish shipments to areas affected by the salmon shortages.

Scientists have mostly blamed the problems on a series of heat waves in the Bering Sea and North Pacific Ocean from 2014 to 2019. The warm ocean waters affected salmon’s living in the sea before they returned to lay eggs.

Climate change may also be affecting what the salmon are eating. Fishing experts say young salmon are likely filling up on nutrient-poor food because warmer waters drive away healthier organisms (有机物) they normally feed on. “In my opinion, the salmon are starving with climate change,” said Brooke Woods in the Yukon River Inter-Tribal Fish Commission.

The effects of climate change on freshwater environments have also been studied. Vanessa von Biela is a biologist who looked at the rivers, streams and lakes where salmon live. Her team found that Chinook salmon show heat stress at temperatures above 18℃. They start dying above 20℃. In 2019, temperatures on the Alaskan side were above 18℃ for 44 straight days, a recent study found.

The effects of warming waters can be reduced by climate-driven glacier (冰川) runoff, which brings cooler water into rivers and streams. But scientists still expect salmon to begin slowly moving to new areas within Alaska. “Salmon will find a way,” said Biela. “but it’s going to be hard for communities in places where there might not be salmon anymore.”

1. What do the locals rely on salmon for?
A.Food supply.B.Scientific study.C.Green tourism.D.Water improvement.
2. What did the declaration of the disaster bring about?
A.Financial losses.B.Relief funds.C.Economic growth.D.Fast delivery.
3. Which of the following is the effect of climate change in Yukon River?
A.No healthy organisms are left there.B.Salmon there lose the ability to lay eggs.
C.Salmon there go short of nutritious food.D.The temperature remains above 18℃ till now.
4. What can be inferred from the last paragraph?
A.Measures to protect salmon are effective.B.Salmon will not find a way out of the crisis.
C.The amount of salmon will increase greatly.D.Salmon are likely to leave the river for survival.
【知识点】 气候 动物 说明文

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【推荐1】Based on new analysis, we are rapidly approaching major climate change and the effects on society and the environment could be quite severe. Geographers predict that within the next eighty years, current world climate zones could shift and some could completely disappear. Polar regions will get colder while tropical regions will get even hotter, forcing animals to migrate (迁徙) north.

Climate changes like these could lead to the spread of diseases. Tropical storms and hurricanes will not only increase but may also become more intense. If the changes come too quickly, animal and plant species may not be able to adapt fast enough and could disappear.

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However, other planets are experiencing global warming as well as our own and some scientists believe there may be some connection between this. No one knows anything for sure at this point because there is simply not enough data.

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B.To introduce the theme of the whole passage.
C.To summarize the whole passage.
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A.Animal and plant species may not be able to adapt fast enough and could disappear.
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C.Current world climate zones could shift and completely disappear.
D.Natural disasters are becoming more frequent and serious.
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A.Animals and plants won’t die out as long as climate changes slowly.
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C.Friendship is more important than science.
D.Family support plays a key role in science.
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