题型：阅读表达 题类：模拟题 难易度：普通
阅读短文，根据短文内容回答问题。
We've all heard of mermaids. They are the beautiful half-human, half-fish creatures(生物). They have the head and body of a human and the tail of a fish. We also know that mermaids only exist in fairy tales. But where did all the stories about these creatures come from? If you have ever seen a manatee, then you might have an idea.
Manatees, which are also called sea cows, are mammals(哺乳动物) that live in the sea. Since they are mammals, they have to swim up to the surface to breathe air. Many people believe that the story of the mermaid began with the ancient sailors who saw the manatees putting their heads out of the water to breathe. Because manatees are upright when they do this, it looks like they are standing. If a sailor saw a manatee doing this from far away across the sea, it is possible that the sailor would mistake the manatee for a creature that is half-human, half-fish.
Mermaids are described as having very long hair. This is probably because manatees like to swim up to the surface of the water in areas where there is sea grass. Manatees eat all kinds of plants in the sea, including sea grass. The sea grass around the manatee's head when they eat could create a picture of long hair.
Manatees also have powerful tails that are very similar to the fish-like tail of a mermaid. The sailors probably watched manatees come up for air and then swim back below the surface, using their paddle-shaped tails. This would explain why the sailors thought mermaids had fish-like tails.
Do you often listen to music at loud volumes（音量）? {#blank#}1{#/blank#}1 Over one billion young people may end with hearing loss，because of listening to loud noise for long periods of time.
{#blank#}2{#/blank#} It is not safe to listen to sounds that are louder than 85 dB（分贝） for eight hours or 100 dB for 15 minutes. The sound of a busy road is about 85 dB and the sound of a rock concert can be about 100 dB.
Loud noise is harmful to the inner ear. Most of us are born with about 16，000 hair cells（毛细胞） in our inner ears. These cells notice sounds. However, listening to loud noise for a long time can make these cells work too hard and cause some of them to die.This is what causes hearing loss. {#blank#}3{#/blank#}
Some people might think that their music isn't all that loud. {#blank#}4{#/blank#} For example，if you are in a noisy place like the subway，you might turn up your music too loud without knowing it. Later，you might feel uncomfortable.
Here is some advice on safe listening. Over﹣the﹣ear headphones are better than in﹣ear ones. {#blank#}5{#/blank#}And remember not to listen to loud music on your headphones for a long time.
A. Once this happens，it's hard to get your hearing back. B. They do a better job of stopping outside noise，so you can listen at a lower volume. C. You should know that this habit is bad for your hearing. D. The United Nations has standards（标准） for safe listening. E. But this can depend on where you are. |
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