a. 古典的, 正统派的, 经典的【医】 古典的; 标准的, 典型的

class/classical/classify/classification/grade/gradual/gradually/graduate/graduation/diploma
记忆：
1. class [ klB:s] 　n. 班级, 阶级, (一节)课 How many classes do you have in the morning? 你们早晨有多少节课？
2. classic [ 5klAsik ] n.杰作, 名著 adj. 第一流的 Young people should read more classics instead of only pop books. 年轻人应该多读点经典著作，而不能只是看流行书籍。
3. classical [ 5klAsikEl] adj. 古典的, 正统派的, 古典文学的 Classical music can do us good mentally. 古典音乐对我们的精神有好处。
4. 加动词后缀-ify, classify [ 5klAsifai] vt. 分类, 分等 The books have been classified and you may choose those suitable for you. 这些书进行了分类，你可以选择适合你的书籍。
5. classification [ 7klAsifi5keiFEn] n.分类, 分等 The library offers a clear and scientific classification of the books. 图书馆对书籍进行了清晰而科学的分类。
6. grade [ ^reid ] n. 等级, 级别 vt. 评分, 评级 n. 分等级 Their products are of the first grade. 他们的产品是一流的。
7. 加形容词后缀ual, gradual [ 5^rAdjuEl ] adj. 一级一级的，逐渐的 The gradual increase of the temperature was hard to feel, so the frog in it died unexpectedly. 逐渐升高的温度很难被察觉，因而里面的青蛙出人意外地烫死了。
8. gradually [5^rAdjJElI]　adv. 逐渐地 Gradually he is growing taller and taller. 他渐渐长得越来越高了。
9. 加动词后缀-ate, graduate [ 5^rAdjueit, -dVueit ] 到了高级，毕业 Bill Gates didn’t graduate from the university, but his creativity and courage never left him. 比尔•盖茨虽未大学毕业，但是他的创新精神和勇气从未离开过他。
10. graduation [ 7^rAdju5eiFEn ]　n. 毕业 After graduation, we’d better find a job where we can apply what we have learnt. 毕业后，我们最好能找到一份能应用我们所学知识的工作。
11. diploma [ di5plEumE ]　di-p-lo-ma 趣味联想：说得滴水不漏嘛，可以毕业了。 n. 文凭, 毕业证书, 奖状 Diplomas don’t mean abilities. So the employers will check your abilities to solve practical problems. 文凭并不意味着能力。雇主们会检查你解决实际问题的能力。
另类阅读：
Towards graduation, he gradually realized it’s necessary to classify his classmates. Though they were in the same class and the same grade and can get diplomas, their qualities were of great difference. Some were fond of classical music and many just took interest in popular music.