题目内容：
根据题目要求完成下列任务，用中文作答。根据以下所给语言素材和教学目标，完成下面问题。
【语言素材】
A: What would you like for lunch?
B: I'd like some green beans, please.
A : Sure.
B : Thank you.
A: What would you like for lunch?
C: I'd like some eggplant, please.
A: Sorry, no eggplant.
Knowledge objectives: Students could ask someone and express own love for food, such as"What would you like?I'd like ... I like ..."
Ability objectives: Train students'speaking ability through dialogue practice.
Emotional objectives: Develop students'good eating habits.
(1)分析明确教学目标的作用。(10分)
(2)案例中的课时教学目标存在什么问题?请简要分析。(10分)
(3)根据以上问题，修改该教学目标。(10分)
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：