短文填空，根据短文内容和首字母提示，把文中所缺词语补充出来，使短文完整、正确、通顺。（每空限填一词。）

     Nowadays, you can see many people busy on their smartphones(智能手机) if you look a____ Smartphones make our lives easier. But have you ever t ____  about what they mean to your eyes?

    Staring(盯) at smartphones for long time gives you dry eyes and even causes a disease c____ glaucoma(青光眼).

While you're probably not going to stop using your smartphone, there are a few things you can do to protect your eyes. Hold your phone at least 30 cm away from your eyes when using it. Take a break every h____  and try the following: look at something at least five meters away from you and then focus on the tip of your nose. Repeat this s____ times. It should reduce(减少) the discomfort in your eyes.

750立方厘米=____立方分米

20分=____时

“家燕筑巢”和“老马识途”，从行为获得方式看分别属于（  ）

十二届全国人大四次会议通过了《中华人民共和国慈善法（草案）》开启了中国依法治“善”的时代。全国人大通过了《中华人民共和国慈善法（草案）》，说明法律的特征是（    ）

下列句子加线词语使用恰当的是（   ）。