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Skin CancerMelanoma（黑"的相关试题:
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Skin Cancer
Melanoma（黑素瘤）,the deadliest kind of skin cancer,is now the most common cancer in__________(51)
British women,the country's leading cancer organization said Wednesday.Skin cancer has__________(52)
cervical（子宫颈的）cancer as the top cancer striking women in their 20s,according to the latest data from
Cancer Research United Kingdom.
The trend is particularly_________(53)since younger people are not generally those most susceptible
（易患的）to melanoma. Rates of skin cancer are _________( 54 ) highest in people over age 75.
But experts worry that increasing numbers of younger people being diagnosed with skin cancer could be
the_________(55)of a dangerous trend.Women in their 20s make_________(56)a small percentage of all
patients diagnosed with melanoma in Britain,but nearly a third of all cases occur in people younger than 50.
Based on current numbers,Cancer Research UK predicts that melanoma will become the fourth
_________(57)common cancer for men and women of all ages by 2024,and that cases will jump from about
9,000 a year to more than 15,500.
Cancer experts_________(58)the rising number of skin cancer cases largely to the surge in people
using tanning salons."Spending time on sun beds is just as_________(59)as staying out too long in the
sun,"said Caroline Cerny of Cancer Research UK. The organization is starting a SunSmart_________(60)to
warn Britons of the dangers of being too bronzed.
"The intensity of ultraviolet rays in some sun beds can be more than 10_________(61)stronger than the
mid-day sun,"Cerny said.
In the United States,several states require parental approval________(62)minors can use tanning
salons.Wisconsin bans people 16 and________(63)from using tanning beds,and others ban children under
14.At least 29 states have regulations governing minors'use of tanning salons.
In the U.K.,Scottish politicians passed legislation banning those under 1 8 from using tanning beds,
though it hasn't yet been implemented.There are no plans for________(64)in the rest of the U.K.
The World Health Organization has previously recommended that tanning beds be regulated because of
their potential to damage DNA in the skin.
Experts said most deadly skin cancers could be________(65)if people took the proper precautions
when in the sun and avoided tanning beds.
_________(64)
A.debate
B.caution
C.legislation
D.approval
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Sunbath and Skin Cancer
In the summer,millions of Americans will offer up their bodies to the sun rays.A tan mndi-cates health and beauty,and most sun worshippers will sacrifice a lot to achieve it,including themselves.
With each hour, the sun's ultraviolet radiation (紫外线）produces irreversible（不可逆的） damage,hastening the development of unsightly wrinkles.And with each year on the beach or roof-top,the sunbather increases his risk of getting skin cancer. Skin cancer is by far the most common form of cancer. An estimated 400,000 new cases will be detected this year in the United States, and almost all of them can be blamed on over-exposure to the sun.
Fortunately,most of these cancers are highly curable .But they can he disfiguring and take time to treat. For that reason,sun worshippers should treat deity with a good deal of awe（敬畏）. Sunburn,of course,is the initial hazard posed by UV radiation.Prolonged exposure to UV,howev-er , interferes with the production of collagen fibers（胶原纤维）in the dermis（真皮层）, causing the skin to lose elasticity（弹性）and creating premature wrinkles. Further deterioration（恶化）of the dermis deprives the epidermis（表皮层）of nutrition and causes it to become thin and dry.
Cancer is UV's final result.Shortwave radiant energy,especially from the UV-B band,breaks the strands（股、缕）of DN
A. Enzymes（酶）work constantly to rearrange the DNA into proper Se-quence,but with repeated UV exposure,the repair process may eventually break down.Then the mutant（变异的）DNA may produce a colony of cancer cells. But skin cancer may be avoided with a good dose of common sense.People with fair skin and blue eyes who burn easily stand the high-est risk .Special danger spots are the parts of the body most constantly exposed to the sun,such as the cheeks , nose , lower lip and the ears. People who have already developed precancerous（癌变前的）lesions（伤害）or had one skin-cancer growth stand a greatly increased chance of developing others.
Dermatologists（皮肤科医生）recommend avoiding the sun when it is most intense between 11 a.m.and 3 p.m.Anyone who insists on sunbathing should use a good sun screen.These lotions and salves（药膏）contain chemicals that block out the burning UVB radiation while permitting the tanning rays to reach the skin.
The last paragraph of the passage mainly discusses_______.
A.the treatment of the skin cancer
B.the prevention of the skin cancer
C.the parts of the body where cancer is most likely to develop
D.the lotions that work best in fighting against the skin cancer
