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  3. The Sun—A Mixed Blessing A．People in Western countries hav

The Sun—A Mixed Blessing A．People in Western countries hav

游客2025-02-17  9
问题                   The Sun—A Mixed Blessing
    A．People in Western countries have very mixed feelings about the sun. On the one hand it evokes memories of beaches, summer holidays and playful times. Children’s books often personify the sun as a smiling, happy face—typically contrasted with angry, moody rain clouds. In fact, the sun has such positive connotations that the descriptor ’sunny’ refers not only to a state of weather but also to ’cheery, cheerful, or joyous’ moods and dispositions amongst humans. On the other hand, many people fear the sun because of its association with cosmetic degeneration that can cause people to look much older than they actually are. Even more seriously, many people see the sun as a killer— this is because excessive sun exposure can lead to skin cancer which has a very high mortality rate. So is the sun our friend or a foe? The answers are complex and contradictory.
    B．Let’s start with the worst news about the sun. It is a carcinogen. As the National Toxicology Program Report on Carcinogens from the Department of Health and Human Services reports, broad-spectrum UV radiation and solar radiation (what is known as ’sun rays’ ) are thought to contribute to most of the estimated 1.5 million skin cancers diagnosed in the United States each year. This gives the sun the unfavorable distinction of being the leading carcinogen in the United States—ahead of genetic mutations, bad diets, cigarettes, alcohol, chemical exposure and other lifestyle factors. Of these diagnoses, 8,000 sufferers will perish from the condition. The primary cause of this mortality is monastic melanoma—moles that become cancerous and then spread mutated cells into the lymph nodes and eventually through the rest of the body.
    C．Even if you are lucky enough to avoid skin cancer, the sun can still have damaging effects on your skin. This is known as premature aging, so-called because sun damage mimics the skin’s natural aging process, but does so at a much earlier age. The sun causes premature aging by breaking down and mutating collagen—a fibrous, ’glue’-like substance that supports and connects tissue and is responsible for the firmness, suppleness, elasticity and overall appearance of the skin. Skin’s collagen production slows and eventually stops due to aging anyway, but sun exposure accelerates this process. It also mutates collagen cells, producing visible abnormalities on the skin. The slowing collagen production appears as wrinkles, sagging and fine lines, while the mutated cells can take the form of a leathery skin texture, facial ruddiness and blemishes known as liver spots. Together these can dissolve signs of youth and vitality from a person’s looks—an image that contrasts starkly with the smooth, tanned and youthful-looking models we often associate with summer!
    D．The sun does have a lot of positive things to offer humans, however. Firstly, it staves off Seasonal Affective Disorder (SAD), an appropriate acronym for a mood disorder caused by insufficient exposure to light—as such, it is typically associated with winters and is sometimes called ’winter blues’ or  ’winter depression’. SAD, once treated with skepticism by health experts but now widely acknowledged to be a legitimate condition, can create a number of distressing problems. Sufferers may oversleep and find it difficult to be roused in the morning, crave  ’comfort foods’ high in carbohydrates, lack energy, find it difficult to concentrate and may withdraw from social exposure. Together these symptoms can lead to depression, pessimistic feelings of hopelessness and an inability to find pleasurable activities. Researchers are not yet sure of the exact physical mechanism that causes SAD, but they do know that exposure to bright life is an effective remedy. The sun definitely has a palliative effect here.
    E．In other ways, the health-improving effects of the sun can be even more powerful. These effects typically relate to Vitamin D, of which the sun is a great source for two reasons. Firstly, it is completely free, and secondly, our bodies have natural mechanisms that prevent an overdose from internally generated Vitamin D from the sun. Although this vitamin can be sourced from milk, cod liver oil and supplements, solar radiation is still the primary source for most humans. It’s preventative role is important: Vitamin D seems to protect against prostate, breast, colon, kidney and ovarian cancers, benefit bone health, as well as reduce overall mortality and the occurrence of cardiovascular events— mortality from strokes and heart attacks is up to forty percent higher in some countries during winter months, a connection linked to lack of sun exposure. In fact, skin cancer rates rise with proximity to the equator amongst light-skinned people, but the prognosis of most other cancers is exactly the opposite. Indeed, the overall benefits of sun exposure outweigh the risks when it comes to cancer, even though the sun is a well-documented carcinogen.
    F．Ultimately, moderation and protection may be the key when it comes to sun exposure. This is true of other carcinogens such as alcohol as well—studies suggest that binge drinkers and teetotalers experience higher levels of many health problems than people who drink moderate amounts of alcohol on social occasions. Healthy access to the sun involves wearing broad-spectrum sunscreen before every exposure (even in winter)and not staying in the sun any longer than is necessary, which is about five minutes for adequate Vitamin D exposure. With these simple steps, the sun once again becomes our friend and not our foe.
Questions 1-6
    Reading Passage 1 has six paragraphs, A-F.
    Which paragraph contains the following information?
    Write the correct letter, A-F, in boxes ] -6 on your answer sheet. [br] A description of the physical process that makes someone look older
选项
答案 C
解析
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