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听力习题：

　　19.

　　A. Lack of vitamins is the main cause of skin cancer.

　　B. New research proves that sunbathing causes noproblems at all.

　　C. The danger of the sunshine has been ignoredbecause of its benefits.

　　D. Proper exposure to the sun can contribute a lot to our health.

　　20.

　　A. Stomach cancer.

　　B. Skin cancer.

　　C. Lung cancer.

　　D. Blood cancer.

　　21.

　　A. It helps people get up early.

　　B. It produces Vitamin D.

　　C. It kills cold viruses.

　　D. It enables us to look healthy.

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