2017闵行区一模阅读理解They swim lovely along the shore looking
时间:2017-01-05 08:40 作者:admin 来源:本站整理
They swim lovely along the shore, looking for underwater greens to feed on. But these days, along Florida’s western coast, something is mixing with the sea grass that manatees(海牛) like to eat. And it’s making them sick - even killing them.
It’s a poisonous form of algae, usually called “red tide” because of its color. Algae are plant-like organisms that live mainly in water. Most are harmless, but not red tide. When it gets mixed in with the grass and the manatees eat it, they get so sick that they can’t even swim.
“They’re basically paralyzed(瘫痪的), and they become unconscious,” said Virginia Edmonds, an animal care manager. Manatees are mammals and they need to surface often to breathe in air. If a manatee is paralyzed, it can’t swim and will drown.
As of Monday, the current red tide outbreak has killed at least 174 manatees since the beginning of this year. That has already beaten Florida’s record-high number for manatee deaths in a single year - and we still have nearly nine months to go!
The experts aren’t sure when the red tide outbreak will end. So many more manatees are in danger. The situation has gotten so desperate that Florida zoos have rescued at least a dozen manatees. You can find manatees anywhere from Brazil up to Florida - and throughout much of the Caribbean Sea.
In fact, the manatee is officially considered an endangered species. Thanks to the US government’s protection, Florida’s manatee population has grown to approximately 5,000 in recent years. But the red tide is threatening their survival. Some experts suspect that pollution from farms even might be fueling the red tide outbreak, because fertilizer that’s used on farms often winds up in water. And when that fertilized water runs off into the Gulf of Mexico, it makes things grow faster - just like on land.
56. The word “them” (in the 1st paragraph) probably refers to “________”.
A. underwater greens B. algae
C. manatees D. endangered animals
57. We can learn from the passage that the red tide ________.
A. causes 174 manatees’ deaths every month B. disables manatees’ ability to surface to breathe
C. has destroyed most of the underwater greens D. helps to fertilize farm lands
58. Which of the following is NOT mentioned in the passage?
A. The experts’ efforts to keep the red tide from spreading.
B. The potential cause of the expansion of the red tide.
C. The present situation of manatees in Florida.
D. The deadly effect of the poisonous red tide on manatees.
59. What does the passage mainly talk about?
A. The red tide has been changing the manatees’ habitant. B. The manatee is officially an endangered species.
C. More efforts should be made to save the manatees. D. The red tide has been threatening the manatees.
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