Question

阅读理解 　　Vitamin D helps bones and muscles(肌肉)grow strong and healthy．Osteoporosis is a common problem as people get older．Low levels of vitamin D can lead to some problems which are mainly found in children．Also, more and more research is suggesting that vitamin D might help prevent many diseases． 　　The easiest way to get vitamin D is from sunlight．But many people worry about getting skin cancer and skin damage from the sun．Darker skinned people produce less vitamin D than lighter skinned people．Production also decreases(减少)as people age, and people living in northern areas have lower levels of vitamin D than people in southern areas as they get less sunlight． 　　Not many foods naturally contain vitamin D．Foods high in this vitamin include oily fish, such as salmon, tuna and mackerel, and fish liver oils．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, in which it has been added, like 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 not to stay in the sun too long because of the risk of skin cancer． (1) According to the first paragraph, osteoporosis is most probably a disease of the ________． [　　] A． head B． heart C． bones D． skin (2) All of the following foods naturally contain Vitamin D EXCEPT ________． [　　] A． salmon B． cheese C． egg yolks D． milk (3) According to the last paragraph, some experts worry that ________． [　　] A． more and more people will have skin cancer B． too much vitamin D may harm people's health C． some people may refuse to have vitamin D level tests D． vitamin D may not be as important as doctors think (4) What can we learn from the passage? [　　] A． Kids need vitamin D more than any other vitamin． B． Skin doctors don't want people to walk in the sun． C． Old people usually have higher levels of vitamin D than the young． D． People living in the south generally have higher levels of vitamin D than northern people．

Answer 1

答案：1．C;2．D;3．B;4．D;
解析：

(1)	词义猜测题。根据前文的Vitamin D helps bones and muscles grow strong and healthy．Osteoporosis is a common problem as people get older．可知维他命D有助于骨头和肌肉的强壮，而osteoporosis是一种随着人变老而普遍产生的疾病，故可推知答案。
(2)	细节理解题。根据第三段的But most of the vitamin D in the American diet comes from foods, in which it has been added, like milk．可知牛奶并不是天然含有维他命D，而是人工添加进去的。
(3)	推理判断题。根据最后一段的some experts worry that if people take too much vitamin D, it might act as a poison．可知过多地摄取维他命D可能会使其产生毒药的效果，故可推断有些专家担心过多的摄取维他命D会有害健康。
(4)	简单判断题。根据第二段的people living in northern areas have lower levels of vitamin D than people in southern areas as they get less sunlight．可推断阳光更加充裕的南方地区的人身体中所含维他命D的量会比北方的人高。