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高三阅读理解Wildlife officials in Utah have been stocking

时间:2019-03-14 19:32  作者:Edmond  来源:www.2abc8.com

Wildlife officials in Utah have been stocking their remote mountain lakes by dropping fish from airplanes since 1956. And on Aug. 21,the Utah Division of Wildlife Resources ( DWR) shared a video of them doing just that. In the video,the small fish erupt from the bottom of an airplane into the water.

    It might seem like the fall from the plane would result in a fatal (致命的)end for the fish, but the Utah DWR explained that at least 95 percent of the fish are expected to survive. “ That’s because the young fish are so small-only 1 to 3 inches(2. 5 to 7. 6 centimeters)long—that they fall to the water like leaves,"said Phil Tuttle, the outreach manager for the southern region office of the Utah DWR.

 “ The pilot flies just above the tree line to drop the fish,or as low as possible while considering other natural barriers like cliffs and mountains,” Tuttle told Live Science in an email. Years of netting surveys(collecting fish in a net and counting them) and decades of recreational fishing suggest the fish do all right after the drop. Utah DWR staff members have also conducted netting surveys within minutes of a drop to check survival rates.

More than 200 of Utah’s remote mountain lakes are stocked every year using this aerial (航空的)fish-drop method. The lakes are often far from any road and can take a long time to reach by land, which makes land transports more stressful for the fish compared with aerial transports.

Most of the stocked lakes would be fishless,were it not for the DWR' s stocking efforts. The DWR primarily stocks lakes with sterile fish so they can control the population and minimize (减至最小)their impact on native wildlife species. The most common species to make these flights are various species of trout(鲑鱼).

28. What is the possible reason for the high survival rate of the fish?

A. Their thick skin. B. Their small size,

C. Their strong body. D. Their good appetite.
29. How can Utah DWR get to know the survival rates of the fish?

A. By doing netting surveys. B. By counting natural barriers.

C. By recording the drop height. D. By holding fishing competitions.

30. Why do Wildlife officials in Utah drop fish from airplanes?

A. It's the cheapest way available. B. The lakes are unreachable by land.

C. It’s better for the fish than land transports. D. They want to train the fish in a special way.

31. What does the underlined word “sterile” in the last paragraph probably mean?

A. Fierce and aggressive. B. Unable to produce babies.

C. Completely free from bacteria. D. Energetic and good at jumping.


答案

 28. B 29. A 30. C

31. B

 

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