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    Doctors warn people that one may develop skin cancer with his skin ________ to the sun too much.

    A. exposes             B. exposing             C. exposed             D. being exposed

    C

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    Vitamin D helps bones and muscles grow strong and healthy. Low levels of vitamin D can lead to diseases such as rickets (佝偻病), mainly found in children. The thinning of bone is a common problem as people, especially women, get older.
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    It's easy to take your hearing for granted until it's too late.

    With the wide    1   _(popular) of digital entertainment products, it is not uncommon to see people wearing headphones and listening to music    2    running in the park or using public transport. And the volume is often so loud that people around    3    can hear the music as well.

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