除病毒外的绝大多数生物都是由细胞构成的．细胞是生命活动的基本单位。

某台湾旅行团要来大陆祭拜中华民族的“人文初祖”，他们应该去 （   ）

“紫荆怒放，莲花添彩，港澳回归祖国了！”2017年是香港回归祖国（    ）

材料一：动漫《那年那兔那些事儿》，是一部爱国主义题材的动漫作品，放在视频分享网站B站后引发很多年轻人的追捧，其中的经典台词“每一个兔子都有大国梦”不胫而走，“幸福并感激着”“此生无悔入华夏”“厉害了我的国”……弹幕上“泪目”刷屏。凭借弹幕这种看似“众声喧哗”的方式，青年人在网络上大声表达正能量。

材料二：党的十八大以来，我国“小粉红”（网络爱国青年）“小青马”（青年马克思主义者）群体蓬勃兴起，他们“肤白貌美三观正，爱国也要‘萌萌哒’”。

材料三：美国学校经常组织学生“效忠宣誓”，宣誓效忠美利坚合众国国旗及效忠所代表之共和国。在演奏国歌或面对国旗时，他们会做出用右手按心口的“效忠宣誓”的标准姿势。近50万辆校车上播放最多的歌曲是《上帝保佑美国》《美丽的美利坚》。对于成年人，多数节庆活动都在强化爱国主义教育，10个联邦法定假日中8个与此相关；各种盛大集会，体育賽事等开场前必唱美国国歌；好莱坞出品了大量的“主旋律”电影……

    Are you interested in students in other countries: Do they also have so much homework like you? What do they do in their spare time?

    On April 8,a report came out on the lives of high school students in China,Japan,South Korea and the US.It surveyed（调查）around 6,200 students from the four countries last year.You will find the answers to many of your questions in this report.

    Who study hardest?

    Chinese students spend the most time studying.Nearly half of Chinese students(48.6%) spend more than two hours on their homework every day.That's much more than students of the US(26.4%),Japan(8.2%) and South Korea (5.2%).

    Who sleep most often in class?

    Japanese students fall asleep in class most often.About 45% of them said they sometimes sleep in class.In South Korea, it's 32%;in the US,21%;and 5% in China.

    Who are the most distracted（分心的）?

American students are the most active in class,but also the most distracted.64.2% said they chat with friends in class;46.9% said they eat snacks in class;and 38.9% said they send emails or read storybooks in class.

    What do they do after school?

    In their spare time, most Chinese students study or surf the Internet.Most American students go out to play with their friends.Most Japanese students do physical exercises.Most Korean students watch TV.