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【单选题】
紫外线引起红斑反应最强的波段是A.
400~320nm
B.
280~180 nm
C.
320~280 nm
D.
400~280 nm
E.
320~180 nm
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A.
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B.
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A.
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【单选题】Why does Jacky think the Internet is healthier than television?
A.
You do not have any choice when watching TV.
B.
You communicate with other people on Internet.
C.
Television does harm to your body’s health.
D.
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