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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  80
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.
【C7】
选项 A、elastic
B、alert
C、awake
D、open
答案B
解析 根据healthy的语义，可知心率变化是人脑健康的积极反应，从而让大脑进一步地调节心脏(is…able to regulate the heart)。B项alert“警惕的，机警的”代入后，句意为“大脑警觉性高，有能力调节心脏”。A项elastic“灵活的”强调能很容易超出平常的界限而做的延展或扩张，语义不适用于此。C项awake“醒着的”，但心率根据呼吸而发生变化这一生理现象与大脑的清醒状态无关。D项open“开放的”语义和逻辑均不能有效对应healthy和regulate the heart。
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