分析 本文介绍了乌鸦在夜里唱歌与被暴露在光里有关,它们被暴露的时间越久,就变得越活跃.如果这样长期暴露的话,它们就会唱歌很多,也就会损失很多能量,对健康有影响.
解答 42.B 细节理解题.根据"His study shows that when robins are exposed to light at night in the lab,it leads to some genes being active at the wrong time of day.And the more birds are exposed to light,the more active they are at night."可知,如果乌鸦被暴露在光下,它们就很活跃,也就越喜欢唱歌.故答案B正确.
43.B 细节理解题.根据"There have been a couple of studies suggesting they are increasing their song output at night and during the day they are still singing.Singing is a costly behavior and it takes energy.So by increasing their song output,there might be some costs of energy."可知,答案B正确.
44.A 词义猜测题.根据"And it is not just robins that are being kept awake by artificial light.Blackbirds and seagulls are also being"可知乌鸦和海鸥情况也一样,也就是说这两种鸟晚上也唱歌,故选择A.
45.A 细节理解题.根据文章最后一段的"It is thought that they are capitalising on their predators(天敌)fleeing to quieter areas."可知,它们的天敌都去了安静的地方,故选择A.
点评 做阅读理解题,要掌握每种题型的解题技巧.如:细节理解题,要在文章中找到问题的信息句,根据信息句判断正确的答案;词义猜测题,要通读该词的上下句,猜测正确的词义.
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