Other research has found the effect of night­time lighting on the body may contribute to unhappy feelings.But it's too early to suggest that sleeping in the dark will help prevent obesity，a known risk factor for breast cancer.The findings are reported in the American Journal of Epidemiology.

　　Previous research has drawn similar conclusions.A team at Ohio State University examined how night­time light affects weight，body fat and glucose intolerance(葡萄糖过敏)in mice.They found that continuing exposure to even a little night­time light caused increases in all three aspects.

　　Light changes mood，physical strength and even the way we process food in a 24­hour cycle.Artificial light is known to interrupt the body clock by delaying the production of the sleep hormone melatonin(睡眠荷尔蒙褪黑激素)．So there is no harm in trying to make bedrooms darker.

　　1. What does“piling on the pounds”in the first paragraph mean?

　　A．Putting pounds into a pile.

　　B．Filling in with pounds.

　　C．Making a lot of money.

　　D．Gaining body weight.

　　2．From the passage，we know that ________.

　　A．sleeping in the dark must help prevent obesity

　　B．lighting on the body at night makes people happy

　　C．night­time light may affect human beings and mice

　　D．it is easy for women to become fat and have cancer

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