专升本考试

【单选题】Vitamins are important to our health．Difierent vitamins are found in difierent foods．grains．vegetables and fruits，fish and meat，eggs and milk products．So which foods should be eaten to get enough of the vitamins our bodies need Let us look at some important vitamins for the answer．
VitaminA、helps prevent skin and other tissues from becoming dry．People who do not get enough VitaminA、cannot see well in darkness．They may develop a condition that dries the eyes．This can result in infections and lead to blindness．VitaminA、is found in fish liver oil．It is also in the yellow part of eggs．Sweet potatoes．carrots and other darkly colored fruits and vegetables contain substances that the body can change into VitaminA．
VitaminB、is also called thiamine(硫胶)．Thiamine changes starchy foods jnto energy．It also helps the heart and nervous system work smoothly．Without it．we would be weak and would not grow．We also might develop beriberi(脚气病)．Thiamine is found not iust in whole grains like brown rice．but also jn other foods．These include beans and peas．nuts．and meat and fish．
VitaminC、is needed for strong bones and teeth．and for healthy blood passages．It also helps wounds heal quickly．The body stores little VitaminC．So we must get it every day in foods such as citrus fruits，tomatoes and uncooked cabbage．
VitaminD、increases levels of the element calcium(铲)in the blooD、Calcium is needed for nerve and muscle cells to work normally．It is also needed to build strong bones．VitaminD、prevents the children’s bone disease rickets(佝偻痫)．Ultraviolet light from the sun changes a substance in the skin into vitaminD、Fish liver oil also contains vitaminD．In some countries．milk producers add vitaminD、to milk so children will get enough．
Vitamin K is needed for healthy blooD、It thickens the blood around a cut to stop bleeding．Bacteria in the intestines f肠道)normally produce vitamin K．It can also be found in pork products．1iver and in vegetables like cabbage．kale and spinach．
It can be inferred from the passage that______.
A．vitamins are sometimes not necessary to our health
B．it is important to eat a mixture offoods every day
C．one food only contains one vitamin
D．fruits contain more vitamins than vegetables
网考网参考答案：B
网考网解析：
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