四、翻译(英译汉)
　　51.The best evidence for the layered mantle(地幔)thesis is the well-established fact that volcanic rocks found on oceanic islands, islands believed to result from mantle plumes(地柱)arising from the lower mantle, are composed of material fundamentally different from that of the midocean ridge system, whose source, most geologists contend, is the upper mantle.
　　答案：分层地幔的证据就是在海岛上发现的火山岩这一明显的事实。岛屿被认为是从低层地幔升起的地柱形成的，它构成的基本成份与海中的山脊系统根本不同，许多地质学家认为它起源于上层地幔。
　　五、写作
　　52.Directions: For this part, you are allowed 30 minutes to write a composition on the topic "Reading Selectively or Extensively". You should write in no less than 100 words, and base your composition on the outline given in Chinese below:
　　1. 现在社会上有各种各样的培训班
　　2. 有些人认为有必要参加课外培训班，有些人则认为没有必要
　　3. 你的观点
　　答案：
　　Is it Necessary to Attend Training Classes?
　　All across the country a great diversity of custom-made classes are mushrooming, in which special training is provided concerning computer skills, arts, sports, and other extracurricular specialties like maths and writing. Among them language crash courses for various tests, such as CET, BEC, TOFEL, IELTS, GRE and so forth, are especially noticeable for its wide range and high attendance rate.
　　Some consider it advisable to attend such classes while others believe it unnecessary. The former argues that it’s far more effective to command these special skills with the help of an experienced trainer than to work at them on their own. They are convinced that these training classes can make up for what is not taught in school, hence, more competitive edge over their peers. The latter group of people, nonetheless, criticize it as a sheer waste of resources. They warn that the quality of most training courses is questionable, as they are marketed to get money out of our pocket rather than get knowledge into our head.
　　As far as I am concerned, a little bit of such special training does us no harm, but too much of it can only prove to be counter-productive. Anyhow, the deprived free time can be better invested in recreation at weekends, talking to an old friend, or simply enjoying a long-overdue vacation.

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