（体裁:说明文 话题:如何吃的健康 难易度:☆☆☆☆）
Time to Stay Healthy
Being overweight(超重的) isn’t good for our health. Our country has made a plan to help everyone stay healthy.
Are you overweight? Your Body Mass Index(BMI)(体质指数) helps you know!
BMI=$\frac{weight(\mathrm{kg})}{height^2(\mathrm{m}^2)}$ =
注:凡BMI大于或等于相应性别、年龄组“超重”界值点者为超重。
BMI对照表
| Age | Boy overweight超重指数 | Girl overweight |
|-----|------------------------|-----------------|
| 8 | 17.8 | 17.6 |
| 9 | 18.5 | 18.5 |
| 10 | 19.2 | 19.5 |
| 11 | 19.9 | 20.5 |
| 12 | 20.7 | 21.5 |
To help us eat healthily and happily, our country gives some suggestions.
• Eat more kinds of food. Try to eat 12 or more different food every day and 25 or more every week.
• Eat in order. First, we should eat vegetables. Then, we eat meat, fish and eggs. At last, we eat rice, noodles and potatoes.
• Eat slowly and eat on time. It is good to have 20 minutes for breakfast and 30 minutes for lunch and dinner.
• Eat healthy snacks like nuts and yogurt. Don’t eat any snacks after 9 p.m.
• You can eat ice cream or cookies, but only once or twice a week.

[新情境·生活运用]读短文,选择正确的答案,并回答问题。
() 1. [新趋势·学科融合]Alice is a 12-year-old girl. Her BMI is 23. She is .
A. overweight B. not overweight C. thin
() 2. [新趋势·学科融合]Ken is a ten-year-old boy. He’s 140cm tall and weighs 35kg. Is he overweight?
A. Yes, he is. B. No, he isn’t. C. We don’t know.
() 3. How many kinds of food should we eat every week?
A. ≥12. B. ≥25. C. ≤25.
() 4. From this passage, we know that .
A. it is good to spend 20 minutes on your lunch
B. it is not healthy to eat any snacks after 9 p.m.
C. we can’t eat ice cream or cookies
5. What are you going to eat this evening?

6. Do you often eat ice cream or cookies?

1.A 2.B 3.B 4.B
5. I'm going to eat carrots, tomatoes and fish.
6. No, I don't.

【分析】
先通读短文，明确BMI的计算方法、超重判断标准及健康饮食建议的内容。再逐个分析题目：1题需对比12岁女孩的BMI超重界值判断；2题要先计算男孩的BMI再与对应界值比较；3题直接找每周食物种类的要求；4题需逐一核对选项与原文细节；5、6题是开放题，结合健康饮食要求作答。
【解析】
1. 根据BMI对照表，12岁女孩的超重界值为21.5，Alice的BMI是23，23≥21.5，属于超重，故选A。
2. 先统一单位：Ken身高140cm=1.4m，计算BMI：$\frac{35}{1.4^2}=\frac{35}{1.96}≈17.86$；对照表中10岁男孩超重界值为19.2，17.86＜19.2，不属于超重，故选B。
3. 原文提到“Try to eat 12 or more different food every day and 25 or more every week”，即每周至少吃25种食物，故选B。
4. 选项A：原文说早餐需20分钟，午餐、晚餐需30分钟，错误；选项B：原文明确“Don’t eat any snacks after 9 p.m.”，说明9点后吃零食不健康，正确；选项C：原文说冰淇淋或饼干一周可吃1-2次，并非不能吃，错误，故选B。
5. 开放题，符合健康饮食要求即可，示例：I'm going to eat vegetables, rice and fish.
6. 开放题，结合实际情况作答，示例：No, I don't.
【答案】
1.A 2.B 3.B 4.B
5. I'm going to eat carrots, tomatoes and fish.
6. No, I don't.
【知识点】
阅读理解、BMI计算、健康饮食建议
【点评】
本题结合生活实际，考查学生对短文细节的理解及简单计算能力，贴近日常，难度适中。
【难度系数】
0.5