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题型:阅读理解-阅读单选 难度:0.65 引用次数:58 题号:22479357

Manatees — often called sea cows — are an anomaly in the animal kingdom. Neither predator nor prey, these peaceable creatures, which can grow to 13 feet and weigh more than 2,000 pounds, are evolutionarily devoid of aggression. Crystal River — “Manatee Capital of the World” — is the epicenter of their presence and recovery.

Yet despite some gains, manatees still face grave threats. Three-quarters of Florida’s 22 million people live along the coast, many in prime manatee habitat, where the strain of human-presence has degraded the state’s enchanted springs, waterways, and wetlands. In Indian River Lagoon, for example, an important manatee habitat along Florida’s densely populated east coast, decades of human waste, sediment from real estate development, and fertilizers from lawns and farms have clouded the water. That has killed seagrass, manatees’ main food source there. More than a thousand manatees have died in the lagoon during the past two years.

What people don’t understand is the need to help support them in waterways. That means restoring seagrass beds and freshwater aquatic vegetation, the basis of their existence and of the overall health of Florida’s waters. Steps to reverse the damage started small. Neighbors gathered with rakes, scooping up algae by hand. Ironically, it was Save Crystal River — the group environmentalists had opposed during their fight over the manatee’s endangered status — that spearheaded the restoration of aquatic vegetation. With funding from the state government, Save Crystal River hired Sea& Shoreline, an aquatic restoration firm, to remove the waste and replant the river bottom with eelgrass, which grows long, ribbon like leaves.

While the prospect of replanting the entire river was daunting, after vacuuming more than 300 million pounds of detritus and planting some 350,000 individual eelgrass pods by hand, the groups have flipped the river back to an ecosystem no longer dominated by algae.

Instead of spending the few short winter months in Crystal River before heading back out into the Gulf of Mexico to graze, some manatees now linger here year-round, enjoying fat times. Aerial surveys from January 2022 revealed the highest number of manatees ever recorded in these waters — more than a thousand in Kings Bay alone.

1. What is a feature of manatees?
A.They are gentle animals.B.They feed on small creatures.
C.They are slightly aggressive.D.They look cute for their shape.
2. What is the main reason for manatees’ decline?
A.Climate change.B.Habitat loss.
C.Low food supply.D.Human activities.
3. How did Save Crystal River help improve manatees’ endangered situation?
A.By removing wastes from the river.
B.By raising funds from the government.
C.By replanting algae in the river bottom.
D.By refining manatees’ living surroundings.
4. What can we learn about manatees from the last paragraph?
A.They enjoy the cold winter of Mexico.
B.They remain in Manatee Capital for long.
C.They head towards the warmer waters during winter.
D.They have the largest population ever recorded globally.
【知识点】 动物 科普知识 说明文

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