材料：在十二届全国人大一次会议上，《政府工作报告》提出，今年要更好地发挥积极财政政策在稳增长、调结构、促改革、惠民生中的作用，结合税制改革完善结构性减税政策，着力强化财政支出结构，继续向教育、医药卫生、社会保障等民生领域和薄弱环节倾斜，严格控制行政经费等一般性支出，勤俭办一切事业。中央预算内投资主要投向保障性安居工程，农业、水利、城市管网等基础设施，社会事业等民生工程，节能减排和生态环境等领域。

结合材料，分析国家财政的作用。

宇航员在失重的太空舱内可以完成的实验是（   ）

    我国西北干旱地区的地下水，主要来自呈扇形分布于山前平原地带或山间盆地的冲积物中。在2000多年前的西汉时期创建了一种特殊的引水工程：坎儿井。如下图所示，坎儿井由地下的暗渠和地面上的竖井、明渠、蓄水池组成。竖井是开挖地下暗渠的通道，暗渠与地下水流向成斜交，上游挖至地下含水层中，渗溢出来的地下水顺着暗渠流出地面，明渠将暗渠流出的地下水引入蓄水池，蓄水池起了调蓄灌溉水量的作用。

Four apps for students to learn English

    Quizlet

    Quizlet is a learning app—a computer program you use on your mobile device. It can help users build and test their knowledge of English words and terms. Quizlet has word sets for millions of subjects. And, it is quickly becoming a useful mobile tool for language learners.

    Socrative

    In Socrative, teachers can create timed learning games. In class, students compete individually or as part of a team against classmates. One game students love is called space Race. In this game, if a team answers a question correctly, their rocket moves forward. This team whose rocket gets to the end first wins. Also, teachers can use Socrative as an “exit ticket, ”a question they can ask students about what they learned in that day's class. Students write their answers on their mobile devices. Then, the teacher can show the answers on a shared video screen.

    QR Codes

    AQRCodeisakindofsignthatasmartphonecanreadwithitscamera. When your phone camera reads a QR code, it takes you to a website, image, video or anything you want to share. For example, one will take you to the VOA Learning English website.

    Evernote

    Evernote lets users store and share notes, images and recordings in one place. Teachers can also use Evernote to give homework.