【重点诠释】

1．说明文是以说明为主要表达方式，用简洁明了的语言来解说事物、阐明事理，从而给读者提供知识的一种文体。
2．在高考书面表达中，其主要命题形式为图表式作文，有时也以图画式和提纲式作文来呈现写作材料。
3．它要求语言要简明扼要，通俗易懂，说明过程讲究层次性和条理性。
4．这种文体通常用第三人称，时态以一般现在时为主。

【写作案例】

     有朋自远方来，不亦乐乎？Jack第一次从美国来北京做客，想尝尝北京风味，你首选烤鸭。请根据下表所提供的材料，向Jack介绍北京烤鸭(Beijing Roast Duck)。
注意：1.可根据内容要点适当增加细节，以使行文连贯；
2．词数：100左右。第一句已经写好，但不计入总词数。

【高分作文】

     Beijing Roast Duck has the reputation of the most delicious food in Beijing. Eating it is a must-do while you are here. Ducks are slowly roasted over flames by fruit-tree wood，which you actually can see with your own eyes in the restaurant. Among all the restaurants that offer Beijing Roast Duck，Quan Ju De Restaurant，which has a long history of 130 years，and Bian Yi Fang Restaurant，opened in 1833，are the most famous. At table the cook helps you cut the meat into slices. Then the meat is served with green onion and a special kind of sauce.The best roast duck is date-red，shining with oil. It has a crisp skin and tender meat. I am sure you’ll never forget the taste once you’ve tried it.