一个几何体的三视图如图所示,且其侧视图是一个等边三角形,则这个几何体的体积为(    )

《算法统宗》是中国古代数学名著，由程大位所著，其中记载这样一首诗：九百九十九文钱，甜果苦果买一千，四文钱买苦果七，十一文钱九个甜，甜苦两果各几个？请君布算莫迟疑！其含义为：用九百九十九文钱共买了一千个甜果和苦果，其中四文钱可以买苦果七个，十一文钱可以买甜果九个，请问究竟甜、苦果各有几个？现有如图所示的程序框图，输入 $m,n$ 分别代表钱数和果子个数，则符合输出值 $p$ 的为（    ）

打开电视机却不看，明知塑料袋会造成白色污染但仍然使用，明知纸张应该双面使用但还是习惯性地丢弃没有用完的作业本，这表明（    ）

①环保节能工作全都是生活细节小事      ②环保节能应该成为我们的生活习惯

③摒弃不良习惯，必须依靠法制建设      ④环保观念必须长期倡导，使之深入人心

完形填空

    Bike-sharing is a new choice for short journeys in cities．It is good to the1development of the big cities．

    A2by a company found that shared bikes started the nation's3for bikes again．Now more and more Chinese people are4bikes instead of cars to make short journeys in cities．

    An engineer of that company says that since the5of shared bikes，people have made fewer trips by car．The love for shared bikes is not only among 6people，who were born in the 1980s and 1990s，but also among people over sixty．

    At weekends，the number of the riders in Shenzhen reaches the7of all cities．On weekdays，the number of people who use shared bikes to travel to word is8in Shanghai．

    It is said that bike﹣sharing will help9the cities'environment．It not only helps solve the traffic problems，but also will help to make more use of10in cities．Take Beijing as an example if more people choose shared bikes，an area of five Bird's Nest stadiums （体育场）will be saved．

民族文化起着维系社会生活、维持社会稳定的重要作用，是本民族生存与发展的精神根基。