数学老师布置10道选择题作为课堂练习，课代表将全班同学的答题情况绘制成条形统计图(如图)，根据图表，全班每位同学做对题数中位数和众数分别为 (    )

    The film is very exciting and dramatic(戏剧性的), but it is also romantic(浪漫的) and very sad. It is about the ship, the Titanic, which sank in the Atlantic in 1912. It is a love story. The two famous stars are Leonardo Di Caprio and Kate Winslett. They fall in love on the ship, but are not allowed to be together as she is rich and he is poor. Leonardo is excellent as poor, handsome Jack and Kate Winslett is perfect as rich and beautiful Rose. The best thing about the film is the part where the ship is sinking. This love story doesn't have a happy ending.

    Flubber is a comedy. Starring(主演) Robin Williams is a forgetful scientist. He is very forgetful and he even forgets his own wedding(婚礼)! Flubber is the name of the amazing(令人惊奇的) green stuff(物品) that he invents. The plot(情节) is about two bad men who try to steal both Flubber and the scientist's girlfriend. The scientist has lots of silly adventures(历险) with Flubber, and he is really funny as the mad scientist. The best thing about the film is the special effects as Flubber changes into all different shapes and sizes and even does a dance routine(舞蹈动作). It's really an enjoyable film.

根据短文内容，完成表格。

向一定量的碳酸钠溶液中加入105g氯化钙溶液，恰好完全反应，过滤，得到5g白色沉淀和200g滤液，计算：

（1）参加反应的碳酸钠的质量；

（2）碳酸钠溶液中溶质的质量分数．

近期，大范围雾霾天气长时间影响我国东部地区，严重危害人体健康。造成雾霾天气的人为原因有①工业生产中使用矿物作为燃料，大量排放污染物；②汽车尾气的大量排放；③风力小，空气流动不畅；④冬季取暖排放的粉尘。