回答： 目标可行性。比如长生不老，衰老是自然规律，以此为目标就算付出再多也是难以实现的。而如果目标改为延长寿命，那么可以通过健康饮食、适量运动以及良好的心态来实现。那么延长寿命就是值得的，长生不老就是不值得的。 是否适合自己。挑战潜水的记录，如果为了挑战自我创造奇迹然而自己的体能达不到那种程度，结果导致自己出现生命危险，这样的目标就是不值得的。 收获大于代价。比如运动员在奥运赛场上获得金牌，他认为获得的荣誉比那些艰苦的训练、流的汗更重要，那么这样的目标就是值得的。

回答： 学生在考试得高分。方式：listening to the teacher carefully,think more and sovle the problem he meets,cheating in the exam,interfere others when t hey were studying.

回答： cheating in the exam. If it is unfortunate for him to be found cheating in the exam, teacher would not trust him, friend may leave him and he may lose confident.Even if he bluff it out, on the surface he got a high score while he did not learn enough knowledge so that he may find more difficult to go further study.Apart from that, when he grow up, the complex working environement and difficult task may make him crazy without solid knowledge and hard working.Interfere others when they studied, not only did he waste his own time, but also the others' so that none of them study well.As a result, they has little ability to compete with others as time going by.Then,the whole school,the whole town,the whole city may fall behind other conturies. What a terriable consequence, which I won't imagine any more.

回答： 三鹿集团的奶粉三聚氰胺污染事件，2009年石家庄市中级人民法院正式宣布三鹿集团破产。集团破产，声誉急剧下降，员工失业，众多婴儿受到伤害，国家形象受损。