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  3. Whenever I hear a recording of John Denver singing "Sunshine on My Shoulders," I find myself smiling, drawn to a love of the sun

Whenever I hear a recording of John Denver singing "Sunshine on My Shoulders," I find myself smiling, drawn to a love of the sun

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问题     Whenever I hear a recording of John Denver singing "Sunshine on My Shoulders," I find myself smiling, drawn to a love of the sun and outdoors I’ ve had for decades as a Michigan native. Walking barefoot to the lake, playing shirtless in the sunlight, and breathing fresh air feel good. 【C1】______
    Studies have found higher rates of high blood pressure among people with the lowest sun exposure. One reason may be due to nitric oxide, a gas whose production is stimulated when your skin is exposed to the sun’ s rays.【C2】______Vitamin D, which sunlight helps your body produce, is also linked to better heart health. So walk outdoors for 15 to 30 minutes daily.
   【C3】______Research on 280 volunteers there found that people had a reduced heart rate, and lower blood pressure when they walked through a forest than when they spent time in an urban area.
    One of the consequences of modern society is that rarely is our body in direct contact with the ground. The earth has an electrical current.【C4】______Although "earthing" or "grounding" is considered alternative by mainstream medicine, research shows that the practice seems to be able to reduce heart disease risk. So, walk around barefoot whenever possible, let your backyard grass tickle your feet, and dig your toes into sandy beaches.
   【C5】______A 2011 British review of 11 studies found that people who exercised outside generally reported more energy and less anger, tension, and depression—all factors contributing to heart attack—than those who worked out indoors.
[A]Exercising indoors is another option.
[B]It reduces both heart attack and stroke risks.
[C]Exercising outdoors may be more beneficial than working out indoors.
[D]In Japan, walking through forests for healing has become a popular practice.
[E]Direct contact with it may be a stabilizing force for good health.
[F]As a doctor, I can tell you they are also very good for your heart.
[G]You’ll get greater health benefits exercising where it’ s green.
【C2】
选项
答案B
解析 这句之前提到了一氧化氮，后一句提到了维他命D。根据后文判断，此处应解释一氧化氮的作用。只有B项符合，故选B。
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