题目内容
Which is the tallest mountain on the earth? The answer must come fast—MT Everest, at a height of 29,000 feet.
But that is only on land. For, if you were to measure (测量) from the bottom (底部) of the ocean. The tallest mountain in the world will probably be Mauna Kea in Hawaii. It is more than 15,748 feet under the sea and another 13.779 feet above it.
As US scientist Cindy Lee Dover points out that the seafloor is the largest and least known place on the earth. We know more about Mars (火星) and Venus (金星) and the back side of the moon than we know about the seafloor.
Some people have travelled to the deep water of the ocean to try to find all kinds of unknown animals and plants living in the deep water. Even scientists know very little about them. Many of them perhaps do not even have names. Some of the names given by scientists to newly discovered (被发现) animals are really funny. Among them are the spaghetti worms (意大利面蠕虫), named as such it is found in a tangle (缠结), it is often difficult to make out where one ends and another begins! Just like spaghetti.
1.What is the height of the mountain Mauna Kea above the sea?
A.13, 779 feet. B.15,748 feet. C.29,000 feet. D.29, 527 feet.
2.The spaghetti worm ________.
A.doesn’t have a name B.lives in the deep water of the ocean
C.has no end or beginning D.is a kind of new animals on land
3.What’s the meaning of the underlined word “seafloor”?
A.海洋生物 B.宇宙 C.海底 D.山脉
4.Which is TRUE according to this passage?
A.MT Everest is the tallest mountain on the earth. B.We still know very little about the seafloor.
C.Scientists know a lot about the animals in deep water. D.Every sea animal has a very funny name.
Young people are at risk of hearing loss due to listening to loud noise for long periods of time, World Health Organization (WHO) said. The reason is that loud volumes (音量) can harm your hearing. It is not safe to listen to sounds that are louder than 85 decibels (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 (内耳). Most of us are born with about 16,000 hair cells (听毛细胞) in our inner ears. These cells receive 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. Some people might think that their music isn’t all that loud. But this can depend on where you are. For example, if you are in a noisy place | like the subway, you might turn up your music too loud without realizing it. Later, when you listen to it at the same volume in a quiet place, you might feel uncomfortable. WHO said the “safe level” for most sound is below 80 decibels for up to 40 hours a week. But do you know a level of 80 can be the noise of a subway.
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1.According to the story, WHO suggests that it is NOT safe to _____.
A.listen to music every day B.watch TV for over an hour
C.listen to loud sounds for a long time D.go to a concert
2.The sound level of a busy road is about _____.
A.80 dB B.85 dB C.100 dB D.115 dB
3.Why can listening to loud music cause hearing problems? Because it _____.
A.puts our brains under great pressure B.can cause hair cells in the inner ear to die.
C.prevents our ears from resting D.allows people to get used to listening to loud sounds.
4.What will people do when they listen to music in a noisy place?
A.They will turn it up without realizing it. B.They will stop listening.
C.They will do nothing. D.They are likely to listen to music with headphones.
5.Which of the statements below is NOT right according to the article?
A.The noise of a subway is higher 80 decibel .
B.Noise-canceling headphones can get rid of background noise.
C.Keep your device volume at 50 to 60 percent.
D.Don’t use your headphones for more than an hour per day.