A、
Infrared.
B、
Ultraviolet.
C、
Visible light.
D、
Sunspot.
【正确答案】
B
【答案解析】
A、
Lack of vitamins is the main cause of skin cancer.
B、
New research proves that sunbathing causes no problems at all.
C、
The danger of the sunshine has been ignored because of its benefits.
D、
Proper exposure to the sun can contribute a lot to our health.
【正确答案】
D
【答案解析】
A、
Stomach cancer.
B、
Skin cancer.
C、
Lung cancer.
D、
Blood cancer.
【正确答案】
A
【答案解析】
A、
It helps people get up early.
B、
It produces vitamin D.
C、
It kills cold viruses.
D、
It enables us to look healthy.
【正确答案】
B
【答案解析】
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