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As many as 150 miners died in the accide...

As many as 150 miners died in the accident.If only the mine - owners ____ enough attention to the safety measures!

A.paid             B.should pay         C.would pay         D.had paid

 

D 【解析】 试题分析:考查虚拟语气. If only=" I" wish意为“要是…就好了”,后面的句子使用虚拟语气,如果与现在的事实相反就使用过去时;如果与将来的事实相反,就使用过去将来时;如果与过去的事实相反就使用过去完成时。句意:多达150名矿工在这起事故中死亡。要是矿主注意到安全措施就好了。根据句意说明矿主没有注意安全措施是过去发生的事情,故使用过去完成时表示与过去事实相反的虚拟语气。 考点:考查虚拟语气
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Naturally regulate your sleep-wake cycle

Melatonin(褪黑激素) is a naturally occurring hormone(激素) that helps regulate your sleep-wake cycle. Melatonin production is controlled by light exposure. Your brain should produce more in the evening, when it's dark, to make you sleepy, and less during the day when it's light and you want to stay awake. However, many aspects of modern life can disturb your body's natural production of melatonin and your sleep-wake cycle.

Spending long days in an office away from natural light, for example, can impact your daytime wakefulness and make your brain sleepy. Then bright lights at night—especially from hours spent in front of the TV or computer screen—can hold back your body's production of melatonin and make it harder to sleep, However, there are ways for you to naturally regulate your sleep-wake cycle, improve your body's production of melatonin, and keep your brain on a

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