Directions: Write a composition entitled Fast Food. You should write at least 120 words according to the outline given below in Chinese:
1. 快餐在中国十分流行，它是现代快节奏社会的最佳反映;
2. 快餐受欢迎有两条原因。然而，从营养角度来讲，快餐却差强人意;
3. 对快餐还是以偶尔品尝为宜。