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利用如图的实验装置探究“杠杆的平衡条件”． （1） 实验前应先调节杠杆在水平位置平衡，这样做的目的是，若出现图（甲）所示情况，应将杠杆的螺母向（选填“左”或“右”）调． （2） 如图（乙）所示，杠杆在水平位置平衡，记录数据．根据这一次实验数据，小明立即分析得出杠杆的平衡条件，他这种做法的不足是．经老师提醒后，小明继续进行实验，如图（乙），若将A、B两点下方挂的钩码同时朝远离支点O方向移动一小格，则Fifteen years after Titanic smashed box office records and swept the Academy Awards with 11 wins, director James Cameron's favorite starring Leonardo DiCaprio and Kate Winslet is heading back to theaters — this time in 3D. Cameron, who used to criticize other filmmakers for their naive attempts to convert 2D films to 3D, spent 60 weeks and $18 million trying to get the process right for Wednesday's release of Titanic 3D, scheduled to coincide with the 100th anniversary of the real-life disaster. The burning question: How many people have yet to see a movie that took in $1.8 billion during its first theatrical run and has become on all cable movie channels? And for everyone else, is the new look worth the ticket price? It is spectacular: The 3D conversion, designed with obvious care and a great deal of consideration by Cameron, makes "a great film even greater," says Lou Lumenick at The New York Post. The huge ship looks all the more impressive, the shocking disaster scenes all the more "jaw-dropping," and the scene in which Jack rescues Kate from a suicide attempt becomes more "terrifying and romantic" in 3D. The conversion "more than justifies another big-screen voyage." It is needless: Titanic 3D serves as the poster film for "how unnecessary such technological methods are when you have a perfectly good original in the first place," says Ann Hornaday at The Washington Post. "The 3D conversion doesn't look bad, but the added visual depth fails to raise the film's "humanism and spectacle." Occasionally, the 3D "creates distance where there should be romantic intimacy," or distract audiences’ attention by giving background extras a visual weight equal to the scene's main players. The 3D release only serves to remind us that this thrilling, complicated film "has had the right dimensions all along." It changes the future of 3D: Films converted from 2D to 3D, with the promise that vivid lifelike effects will draw audiences into a scene the way "flat" images can't, have generally disappointed, says Peter Howell at The Toronto Star. Titanic 3D, however, "shows how the ambition can be realized if the will and skill are there." Every scene is sharper and brighter. Some shots are "now so thrilling as to almost lead to dizziness." Finally, we're seeing the artistic value of a 3D conversion, which should inspire more filmmakers to follow in Cameron's footsteps. 67. According to the passage, what can be expected from the release of Titanic 3D? A.The date of the first show is fixed on a special date.. B.In the film, Jack and Kate will be rescued. C.More people will go to the cinema to enjoy the new version. D.The film will make a 1.8 billion dollar bonus in the run. 68. It can be inferred from the passage that, James Cameron __________ A.has his own understanding in making 3D films B.didn’t like the idea of converting 2D films to 3D first. C.made little effort to make Titanic 3D D.had to choose Leonardo DiCaprio and Kate Winslet to star in the film 69. According to Ann Hornaday, Titanic 3D _____________ . A.has a poor visual effect. B.makes the distance between the screen and audience closer. C.is unnecessary to make in comparison. D.has a great breakthrough in film making 70. It would be most possible for us to find this article in__________. A. a news review 　　　　　　　　　　　　　 B. an academic report　 C. an entertainment column　 　　 D. a graduation essay