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以“goals”为题打开一篇说明文的思路。
参考思路
1)目标的分类：(可根据时间顺序，空间顺序、逻辑顺序或认识顺序，任选一个进行分类和排列)
2)各个类别的特点和细节：
3)组织成文：
范文点评
goals
everyone has goals. many people do not reach their goals for lack of planning. these three sets of goals should be developed： lifetime， intermediate and short term.
lifetime goals should be written out. these goals should be clear and reasonable. for instance， the goal to win a research prize is clear and measurable. other lifetime goals might include publishing a certain number of influential books or articles， earning a departmental chairmanship at a major university， successfully competing for a grant from the national science foundation or securing a consultantship with a big corporation.
intermediate goals relate to outcomes during the next few years. for the beginning doctoral student， intermediate goals may include completion of course work and preparation of a doctoral research proposal. like lifetime goals， these are measurable and clearly stated.
short-term goals involve outcomes expected during the next 12 months. these goals are more performance oriented， and they help with achievement of intermediate goals. examples of short-term goals are earning an a in a course， learning how to program a computer or performing an experiment.
【点评】本文介绍了人生的三种目标：终生的、长期的和短期的目标。在文中采用了说明文常用的方法：定义、举例、分类和比较等。