But Danny Nicholson, an educationist, said the technology would be impractical to use in schools and could be costly. He said, “While I think the idea of 3D technology is very interesting, I worry that 3D is a bit of an expensive gimmick (噱头). There are a few cases where a true 3D image might help, but most of the time, good 2D models that can be moved would be just as effective. ”

　　In the US,

　　one school district in Colorado is already in the process of having 1,000 3D projectors fixed in classrooms.

　　And the University of Caledonia, which carries out scientific research into the Lake Tabon Basin, has used 3D presentations with Grade Six pupils. Those who watched the 3D presentations were more engrossed

　　and reported a general

　　increase

　　in

　　their interest in science compared with students who watched the 2D version.

　　1. What is the main idea of the first three paragraphs?

　　A. There are slight differences between 3D and 2D images.

　　B. Pupils perform better when 3D images are used in classes.

　　C. Schools have difficulty in making full use of 3D technology.

　　D. 3D technology is always more effective than 2D technology.

　　2. Danny Nicholson holds the view that 3D ________.

　　A. is of no help in classes

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