You may know all about vitamin C, but do you know why vitamin D is also important to your body? Experts from the Children's Hospital in Boston, US, have said that some teens don't get enough of this important nutrient (營養(yǎng)物).

Vitamin D is necessary to develop healthy bones. It is produced by the body with the help of sunlight. It can also be found in certain foods and drinks, such as liver (肝臟) and eggs. However, it is difficult to get enough vitamin D from food alone, which means enjoying the sunshine is very important.

The doctors who ran the study tested 307 adolescents (青少年) to discover how much vitamin D was in their blood. They found that 74 of the children tested-nearly 25 per cent-had vitamin D lack. Of those 74, 14 were severely short of the nutrient. The doctors also found that the amount of the vitamin found in a child's blood was affected by a number of factors(因素). Vitamin D levels drop in winter, probably because less time is spent outside in the sunlight. Diet was also a key factor as well.

Even skin color has an influence (影響), as people with darker skin find it more difficult to produce the vitamin. Vitamin D lack can lead to many health problems for both children and adults. It is also believed that low levels of it can cause depression (抑郁).

56. The best title for the text is __________.

A. Don't hide from the sunshine

B. Don't be short of vitamin C

C. Vitamin C is most important

D. Don't accept sunlight in the sun

57. Which of the following statements is NOT true according to the text?

A. Vitamin D is good for developing healthy bones.

B. Vitamin D is also from a certain food and drinks.

C. Vitamin D isn't important to keep healthy.

D. Vitamin D that comes from sunshine is important.

58. The doctors carried out experiments to __________.

A. compare adolescents' vitamin D and sunshine

B. check how much vitamin D adolescents' blood has

C. discover the amount of adolescents'blood

D. study adolescents' blood type and nutrient

59. The result of lacking vitamin D probably is __________.

A. to improve adolescents' diet B. to make adolescents' blood run quickly

C. to have a great effect on children's skin

D. to lead to many health problems or depression

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科目：高中英語 來源：2011-2012學(xué)年遼寧開原高中高二下學(xué)期期中考試英語試卷（帶解析） 題型：閱讀理解

Casablanca, Sep. 24
A flood swept across the coastal plain about 100 miles southwest of here, killing hundreds of Moroccans in a market place yesterday morning.
Reports from the area said 218 bodies had been counted, and many of the people were missing.
The flood followed heavy rains, which filled the coastal plain and dry river beds and caused them to overflow. The flood, several feet high, hit the village of Khemis Nagua at midmorning yesterday as farmers from the surrounding area joined town people in an open market place. The roaring waters swept the villager’s living places, the market sheds （棚子），shoppers，cattle and farm tools for miles across the plain.
The flood was over almost as soon as it started, the reports said, as the water swept out to sea. Rescue workers quickly moved into the area from Safi, about 25 miles further south.
【小題1】You can learn from the text that ________.

A．hundreds of people died in the flood
B．the flood lasted for several days
C．heavy rains followed the flood
D．the flood hit the village at midnight
【小題2】The report mainly tells the public about__________.
A. how the flood swept the coastal plain
B. the flood in fall
C why the terrible flood took place
D. a rescue attempt
【小題3】According to the text, which of the following maps may be correct?
（ KN="Khemis" Nagua,   C=Casablanca    S= Safi）

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