2. 外语
  3. No organ of the body is less【S1】______than the skin. One of our biggest and busiest organs, it【S2】______the state of our health,

No organ of the body is less【S1】______than the skin. One of our biggest and busiest organs, it【S2】______the state of our health,

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问题     No organ of the body is less【S1】______than the skin. One of our biggest and busiest organs, it【S2】______the state of our health, our age, and our race. Here are some facts about our outer【S3】______organ to show that there is more to the skin than meets the eye.
    Your skin is your body’s thermostat (恒温器). It【S4】______heat gain and loss so that the internal temperature remains within the【S5】______range of 97 to 99 degrees.
    It takes about two square yards of skin to cover the average adult from head to toe. Undoubtedly the most intricate wrapping in【S6】______, the skin contains three million cells, three feet of blood【S7】______, and twelve feet of nerves in each area the size of a postage stamp.
    The【S8】______difference between the darkest human skin and that of an albino (白化病患者) is brought about by not more than 1/25 of an ounce of melanin (黑色素). As far as is known, the【S9】______of this dark brown or black pigment (颜料) accounts for all our【S10】______in racial colors, including yellow, brown, and black.

A) estimated        B) variations          C) existence        D) number
E) vessels          F) appreciated         G) mirrors          H) average
I) covering         J) regulates           K) widest           L) balances
M) amount           N) normal              O) impressive
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大学英语四级

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