【导语】本文是一篇说明文文章主要介绍了因为环境恶化，大西洋鲑鱼的数量急剧减少，我来为大家讲解一下关于高中英语阅读理解和完形填空?跟着小编一起来看一看吧!
高中英语阅读理解和完形填空
【导语】本文是一篇说明文。文章主要介绍了因为环境恶化，大西洋鲑鱼的数量急剧减少。
D
The Atlantic salmon (鲑鱼) of Scotland are hardy and determined animals. Each spring and summer, they return from the North Atlantic Ocean to lay eggs in Scotland’s shallow rivers,leaping up waterfalls and over barriers, pushing themselves upstream in enormous efforts. Some fail, and others succeed, but today they face yet another challenge.
During the mid-1980s, there were between eight and ten million salmon swimming around Scotland’s Atlantic coast; that number has now dropped sharply. There’s evidence of reducing the availability of the salmon’s prey (猎物) as climate change warms and acidifies oceans. New research suggests climate change is also bearing down on rivers, which is bad news for salmon.Adapted to life in cold water, salmon experience slow growth and population changes at high temperatures. Heat influences their health and reduces their resistance to disease.
“Now salmon are struggling to deal with the rising temperatures. There are recent records of 27°C in the upper reaches of the Dee catchment,” says Peter Cairns, director of an environmental charity. In 2018, Scotland recorded the lowest pole catch for salmon since records began. Evidence suggests that the degraded quality of river worsens the impact of our changing climate. “Atlantic salmon evolved using river systems in Scotland that were once way more forested and therefore shaded.” Yet Scotland is today one of the least wooded countries in Europe, with just 3 percent of its native woodland undamaged. Scientists have found that just 35percent of rivers in Scotland have enough tree cover for salmon survival.
A movement to get trees back on riverbanks is gathering pace. “Broad-leaf trees close tothe bank can reduce the light that enters the water,” explains fisheries scientist Anthony Hawkins.A new initiative called Riverwoods — led by the Scottish Wildlife Trust and supported by Scottish Water and several other govemment and regulatory bodies — aims to create a network of woodlands along Scotland’s riverbanks, and has already received a number of large funds.“Money is not the pressing business. River health is complex, but tree planting is one of the most basic things we can get started with right away,”says Cairns.
12. Why do Atlantic salmon make great journeys back to the rivers?
A. They search for foods.
B. They reproduce themselves.
C. The rivers are relatively cool.
D. The seas are increasingly warm.
13. How do the rising temperatures in rivers affect salmon?
A. They grow more quickly.
B. They are more heat-resistant.
C. They are less active in water.
D. They are more likely to get diseases.
14. What is a challenge for salmon when they return to Scotland’s rivers?
A. There is a shortage of food.
B. There is much fish catching.
C. The ecology environment has changed.
D. The river systems are unsuitable for the forest growth.
15. What does Cairns really intend to tell us in the last paragraph?
A. It is urgent to plant riverbank trees.
B. It is too hard to restore the river health.
C. There is enough money for the project.
D. There are too many vital things to deal with.
|
B |
D |
C |
A |
