出海打鱼的渔民特别关注的是（　　）

    There's not just one reason why kids can't fall asleep, though, so there's also more than one____.

    If there's anything about your room that makes you feel ____ at night, like a picture that looks strange in the dark, or a noisy tap that leaks drop after drop, be sure to ask one of your parents if it can be moved or fixed.

    It may not____ make sense why something bothers you, but if it's keeping you from sleeping, it should be changed. Another idea could be getting ready for bed earlier than usual. Try to take more time to ____ by taking a warm bath, or listening to a bedtime story at least30 minutes before you want to go to sleep.

我国人口的长期基本国策是（　　）

①实行计划生育   ②控制人口数量   ③提高人口的质量   ④晚婚、晚育、少生、优生

读《七律·长征》，给下面的词语选择恰当的解释

三军：（    ）。

基因型为Aa与基因型为Bb的动物体细胞混合，用灭活的病毒处理后，不可能获得下列哪种基因型的细胞  (　　)。