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.

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某大型超市从生产基地购进一批水果，运输过程中质量损失10%，假设不计超市其他费用，如果超市要想至少获得20%的利润，那么这种水果的售价在进价的基础上应至少提高（）

如图所示，在京昆高速公路266km处安装了一台500万像素的固定雷达测速仪，可以精准抓拍车辆超速，以及测量运动过程中车辆的加速度．若B为测速仪，A为汽车，两者相距355m，此时刻B发出超声波，同时A由于紧急情况而刹车，当B接收到反射回来的超声波信号时，A恰好停止，且此时A、B相距335m，已知声速为340m/s，则汽车刹车前的正常行驶速度大小为（   ）