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Vitamins
Vitamins are organic compounds which are present in certain foods and are essential to the health of men and other animals.__1__out these substances,the breakdown and absorption of foods could not ain vitamins participate in the formation of blood cells,hormones,nervous system chemicals,and genetic materials.__2__-soluble vitamins include vitamins A,D,E and water-soluble vitamins include vitamin C and the B-vitamin complex.
Fat-soluble vitamins are usually absorbed with foods that contain ssive amounts of these vitamins are stored in the body's fat,the liver and use fat-soluble vitamins can be stored,they do not have to be consumed every day.
__3__.A deficiency of vitamin A leads to skin changes and night blindness,or failure of the eye to adapt to the min A can be obtained directly from foods of animal origin such as milk,eggs,and liver.__4__.
Vitamin D acts muck like a hormone and regulates calcium and phosphorus absorption and vitamin D is obtained from such foods as eggs,fish,liver,butter,and humans get most of their vitamin D from exposure of the skin to sunlight.A deficiency of vitamin D leads to bone problems.
The role of vitamin E in the human body has not been established.——__5__ Vitamin E is found in seed oil and wheat.
Vitamin K is necessary for the clotting of is produced in sufficient quantities by bacteria in the intestine,but is also provided by leafy green vegetables and eggs.
The water-soluble vitamins,C and B complex,cannot be stored and therefore need to be consumed daily to satisfy the body's min C is important in the formation and maintenance of connective protects gums,skin,and mucous is mainly found in fruits like oranges.
B-complex vitamins serve a wide range of important metabolic functions and prevent some are found mostly in the liver.
mins are classified into two groups,that is,the fat-soluble(溶解脂肪的)and the water-soluble(溶解水的)vitamins.
r functions are mainly to enhance the metabolism(新陳代謝)of proteins and fats.
is necessary for a healthy life.
min A is essential for normal growth and for the health of epithelial cells.
has been popularly advocated for a great variety of diseases,but no clear evidence exists that it eases any specific disease.
min A can also be obtained through eating green and yellow fruits and vegetables
標準答案：BADFE
1.B.B中的Their與前句中的mins呼應;而後句的句意(沒有這些物質,食物的碎化和吸收就不能進行。)揭示前句的內容應該是在談論Vitamins的“好處”,同時B中metabolism與後句中提到的“食物的碎化和吸收”呼應。
2.A.A在句意上總領後面兩句：後面兩句分別是在對fat-soluble(溶解脂肪的)vitamins 和 water-soluble(溶解水的) vitamins進行解釋。
3.D.該段的核心詞(反覆出現詞)是vitamin A,而後句談到vitamin A缺乏會造成的問題。在句意上與後句句意相關：一正(功效)一反(缺乏的後果)。
4.F.前句說到Vitamin A能如何被獲得,而F在句意上與之相呼應：談及Vitamin A“還能”怎樣被獲得。
5.E.空格前句說vitamin E在人體中的功能還沒有被確認,後句說vitamin E在哪裏能找到,同C相比,E更合理：E的句意也是表明vitamin E的“不確定的”功效,在句意上前後承接,而C只是籠統的說vitamin E是有必要的。
