Doctors warn people that one may develop skin cancer with his skin to the sun too much. A. exposes B. exposing C. exposed D. being exposed 题目和参考答案——青夏教育精英家教网—

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Doctors warn people that one may develop skin cancer with his skin ________ to the sun too much.

A. exposes B. exposing C. exposed D. being exposed

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Vitamin D helps bones and muscles grow strong and healthy. Low levels of vitamin D can lead to diseases such as rickets (佝偻病), mainly found in children. The thinning of bone is a common problem as people, especially women, get older.
But more and more research is suggesting that vitamin D might also help prevent many diseases. The easiest way to get vitamin D is from sunlight. The sun’s ultraviolet (紫外线的) rays react with skin cells to produce vitamin D. But many people worry about getting skin cancer and skin damage from the sun. As a result they stay out of the sun. Also, darker-skinned people produce less vitamin D than lighter-skinned people. The amount also decreases in older people and those living in northern areas that get less sunlight.
Not many foods naturally contain vitamin D. Foods high in this vitamin include oily fish and fish liveroils (鱼肝油). Farmed fish have only about one-fourth as much vitamin D as wild fish. Small amounts of vitamin D are found in beef liver, cheese and egg yolks. But most of the vitamin D in the American diet comes from foods such as milk.
Research in the last several years has shown that low levels of vitamin D may increase the risk of heart attacks in men and deaths from some cancers. More doctors are now having their patients tested for their vitamin D levels. But as research continues, some experts worry that if people take too much vitamin D, it might act as a poison. Also, skin doctors warn people to be careful with sun exposure because of the risk of skin cancer.
【小题1】The first paragraph is mainly about 　　　　.

A．the muscle diseases	B．the sources of vitamins
C．the importance of health	D．the functions of vitamin D

【小题2】Which of the following people produce the least amount of vitamin D?______

A．Elderly darker-skinned people.	B．Young lighter-skinned people.
C．Elderly lighter-skinned people.	D．Young darker-skinned people.

【小题3】 People can get the most vitamin D from 　　　　.

【小题4】What can we infer from the text?_________
A. Being exposed to sunlight is the safest way to get vitamin D.
B. Lack of vitamin D can make people age quickly.
C. Proper vitamin D levels people need are still not determined now.
D. The vitamin D level is higher in men than in women.

It's easy to take your hearing for granted until it's too late.
With the wide    1   _(popular) of digital entertainment products, it is not uncommon to see people wearing headphones and listening to music    2    running in the park or using public transport. And the volume is often so loud that people around    3    can hear the music as well.
However, doctors warn that such behavior can    4   _(potential) damage their hearing. "In noisy places, people tend   5 _(turn) the volume up to get the same clarity of sound. Unfortunately, that can damage the hearing   6 people being aware of it," said Feng Yongfeng, chief ENT physician at Beijing Tian'an Hospital.
After Spring Festival, the hospital witnessed   7   slight increase in the number of teenagers coming in with hearing problems, 8   Feng attributed to them wearing headphones at home for long periods during the holiday. Feng said both in-ear and overhead headphones can harm the ears and    9   (advise) against using them for long periods. He said if you do use headphones it is worth    10   (invest) in the highest quality you can afford.

It's easy to take your hearing for granted until it's too late.
With the wide    16  _ (popular) of digital entertainment products, it is not uncommon to see people wearing headphones and listening to music    17   running in the park or using public transport. And the volume is often    18  loud that people around them can hear the music as well.
However, doctors warn that such behavior can potentially damage    19__ hearing. "Innoisy places, people tend   20 _(turn) the volume up to get the same clarity of sound. Unfortunately, that can damage the hearing   21  people being aware of it," said Feng Yongfeng, chief ENT physician at Beijing Tian'an Hospital.
After Spring Festival, the hospital witnessed    22  slight increase in the number of teenagers coming in with hearing problems,    23  Feng attributed to them wearing headphones at home for long periods during the holiday. Feng said both in-ear and overhead headphones can harm the ears and    24  (advise) against using them for long periods. He said if you do use headphones it is worth 25  (invest) in the highest quality you can afford.

It's easy to take your hearing for granted until it's too late.

With the wide 16 _ (popular) of digital entertainment products, it is not uncommon to see people wearing headphones and listening to music 17 running in the park or using public transport. And the volume is often 18 loud that people around them can hear the music as well.

However, doctors warn that such behavior can potentially damage 19__ hearing. "Innoisy places, people tend 20 _(turn) the volume up to get the same clarity of sound. Unfortunately, that can damage the hearing 21 people being aware of it," said Feng Yongfeng, chief ENT physician at Beijing Tian'an Hospital.

After Spring Festival, the hospital witnessed 22 slight increase in the number of teenagers coming in with hearing problems, 23 Feng attributed to them wearing headphones at home for long periods during the holiday. Feng said both in-ear and overhead headphones can harm the ears and 24 (advise) against using them for long periods. He said if you do use headphones it is worth 25 (invest) in the highest quality you can afford.

It's easy to take your hearing for granted until it's too late.

With the wide 1 _(popular) of digital entertainment products, it is not uncommon to see people wearing headphones and listening to music 2 running in the park or using public transport. And the volume is often so loud that people around 3 can hear the music as well.

However, doctors warn that such behavior can 4 _(potential) damage their hearing. "In noisy places, people tend 5 _(turn) the volume up to get the same clarity of sound. Unfortunately, that can damage the hearing 6 people being aware of it," said Feng Yongfeng, chief ENT physician at Beijing Tian'an Hospital.

After Spring Festival, the hospital witnessed 7 slight increase in the number of teenagers coming in with hearing problems, 8 Feng attributed to them wearing headphones at home for long periods during the holiday. Feng said both in-ear and overhead headphones can harm the ears and 9 (advise) against using them for long periods. He said if you do use headphones it is worth 10 (invest) in the highest quality you can afford.

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