Dermatologistsrecommend 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 salvescontain chemicals that block out the burning UVB radiation while permitting the tanning rays to reach the skin.
31.According to the passage,overexposure to the sun may result in
A. the wrinkles that cannot be seen.
B.the skin cancer.
C.all kinds of sacrifices.
D.healthful beauty.
32.The underlined word deity in the third paragraph refers to
A.something mysterious.
B.the skin cancer.
C.the sun.
D.overexposure to the sun.
33.Which of the following comes first as a possible damage by UV radiation?
A.Sunburn.
B.The loss of skin elasticity.
C.Dryness of epidermis.
D.The deterioration of dermis.
34.Why may the repair process of the DNA finally fail?
A.Because short wave radiant energy breaks the strands of the DNA.
B. Because the DNA may produce a colony of cancer cells.
C. Because enzymes work to rearrange the DNA into a new order.
D. Because the patient is exposed to UV from time to time.
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