下列词语中没有错别字的一组是(     )

对下面文段中所使用的修辞方法的作用理解正确一项是（     ）

    柳絮般的雪，在空中飘舞一夜后，终于停了。

    第二天清晨，外面变成了粉妆玉砌的世界。地上铺了一层白地毯，它如绸、如缎、如银、如玉……极目远望，茫茫原野，群山奔驰，镶银点翠，分外妖娆。

    没过多久，孩子们都出来了。他们在雪地里跑一段、滑一段，跑一段、滑一段，玩乐着、欢笑着，谁能说整个世界不是他们的？

    When you stay away form your home for a long time, you start to miss your good bed, your good parents. Believe it or not, you're feeling homesick. You can help yourself to feel less homesick. Here's how:

      ⑴   .If you're going away from home, bring your favourite clothes, you can also bring some pictures of the people who you may miss. You can look at them any time you want.

       ⑵   .The busier you are, the less time you'll have to feel homesick. Spend your free time on music, sports or books. Try to join in activities whenever you are.

       ⑶   .You can make a plan for when you'll call your mom or dad. You can also keep in touch with family and friends by email or text messages.

       ⑷   .Sometimes, telling someone that you're feeling a little homesick will help you feel better. Maybe you can tell a friend that you feel homesick and the two of you can do something fun.

“频闪摄影”是研究物体运动时常用的一种实验方法，如图所示的频闪照片记录小球下落时的运动状态。从图中可以看出小球在做____ 直线运动（选填 “匀速”或“变速”），小球此时受到的是____ （选填“平衡力”或“非平衡力”）的作用，小球最后落地是因为____ 。