分析 本文介紹了烏鴉在夜里唱歌與被暴露在光里有關,它們被暴露的時間越久,就變得越活躍.如果這樣長期暴露的話,它們就會唱歌很多,也就會損失很多能量,對健康有影響.
解答 42.B 細節(jié)理解題.根據"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,如果烏鴉被暴露在光下,它們就很活躍,也就越喜歡唱歌.故答案B正確.
43.B 細節(jié)理解題.根據"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正確.
44.A 詞義猜測題.根據"And it is not just robins that are being kept awake by artificial light.Blackbirds and seagulls are also being"可知烏鴉和海鷗情況也一樣,也就是說這兩種鳥晚上也唱歌,故選擇A.
45.A 細節(jié)理解題.根據文章最后一段的"It is thought that they are capitalising on their predators(天敵)fleeing to quieter areas."可知,它們的天敵都去了安靜的地方,故選擇A.
點評 做閱讀理解題,要掌握每種題型的解題技巧.如:細節(jié)理解題,要在文章中找到問題的信息句,根據信息句判斷正確的答案;詞義猜測題,要通讀該詞的上下句,猜測正確的詞義.
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