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  3. A candlelit dinner works wonders for romance. Now scientists say it could also be good for your heart. Breathing in candle smoke

A candlelit dinner works wonders for romance. Now scientists say it could also be good for your heart. Breathing in candle smoke

admin2023-02-24  54
问题     A candlelit dinner works wonders for romance. Now scientists say it could also be good for your heart. Breathing in candle smoke causes beneficial【C1】________in your heart rhythm, they claim. It is thought that tiny salt particles released when the candle burns are【C2】________the effect.
    The researchers monitored the hearts of 13 men and women as they breathed in air【C3】________into a small chamber. In some【C4】________the air included smoke from candles in a second room. The volunteers didn’t know which type of air they were breathing, but when it included candle smoke, their heart rate variability【C5】________.
    Everyone’s heart rate varies【C6】________all the time, beating a little bit faster when we breathe in than when we breathe out This is perfectly healthy and a sign that the brain is【C7】________and able to regulate the heart But this variation【C8】________as we get older and if we【C9】________heart problems In the study, it was increased by【C10】________candle smoke.
    Researcher Christina Isaxon said the concentration of smoke【C11】________during the study was similar to that created by a candlelit dinner. As the volunteers could not see the candles and weren’t told what they were breathing, the effect could not be explained【C12】________by the calming effect of candlelight.
    Dr Isaxon believed that tiny particles of the candle smoke could be responsible for the beneficial effects. These particles are【C13】________regulating the heart’s rhythm and in sending messages between cells in the body. More salts are produced when a【C14】________is still. The study did not find any【C15】________health effects of the smoke—【C16】________she admitted she did not ’make a huge effort’ to find any.
    Soot, black powder in the smoke, from lit candles has been【C17】________health problems in the past. The American Chemical Society has warned that common wax candles release【C18】________harmful chemicals linked to cancer and other illnesses. It recommends using beeswax.
    Dr Isaxon used candles made of a natural fat in her study. She recommended using candles that are as natural as possible and avoiding【C19】________and dyes as they may give off【C20】________chemicals when burned.
【C18】
选项 A、potentially
B、periodically
C、instantly
D、permanently
答案A
解析 句子的语义表明这些化学物质是常见的蜡烛释放出来的，且与癌症和其他疾病相关。换言之，这些诱发癌症和其他疾病的化学物质是对身体有潜在威胁的化学物质。故A项potentially“潜在地”符合语义要求。无判断这些化学物质的危害所持续的时间和方式。因此需排除B项periodically“周期性地”和D项permanently“永久性地”。这些化学物质不可能马上引起癌症和其他疾病，C项instantly“立即地”不能满足逻辑要求。
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