四、(2025·连云港东海县期中)阅读海报，选择正确的答案。

()1. What does the word “lungs” mean in Chinese?
A. 肠道
B. 胃
C. 肺
()2. Which is a wind instrument(管乐器)?
A. The erhu.
B. The trumpet(小号).
C. The piano.
()3. What can we learn from the poster?
A. The second - hand smoke is not bad for the lungs.
B. Everyone shouldn't go running or swimming to keep healthy.
C. We can improve the air inside by opening the windows.

四、1. C 解析：由“Stop smoking.”“Avoid second - hand smoke.”“Don't stay in the dirty air for a long time.”以及“Improve indoor air.”并结合常识可知，烟、二手烟和脏空气直接危害的是人体的肺部，因此推断 lungs 的意思是“肺”，故选 C。
2. B 3. C

五、新情境 知识科普 阅读牙齿的相关介绍，判断正(T)误(F)并回答问题。
Teeth do important work. They help us chew(咀嚼)food and talk clearly. Our teeth have different shapes. Round back teeth grind(磨碎)food to make it easy to swallow(吞咽). Sharp front teeth bite into food. Brushing keeps teeth clean. So brush your teeth every morning and before bedtime. Change your toothbrushes every three months. Visit the dentist twice(两次)a year. Dentists clean our teeth and check for cavities(龋洞). A cavity is a part of a tooth that is not healthy，and a dentist can fix it. Kids have 20 teeth. They fall out. New ones grow in. Adults have 28 to 32 teeth. It is very important to take good care of our teeth!
()1. Teeth can help us chew food，but they can't help us talk clearly.
()2. We use sharp front teeth to grind food because this makes the food easy to swallow.
()3. Kids' 20 teeth fall out. And 28 to 32 new teeth will grow in.
()4. We should change our toothbrushes twice a year.
5. How can we take good care of our teeth?

五、1. F 解析：由“Teeth do important work. They help us chew food and talk clearly.”可知，牙齿既可以帮我们咀嚼食物，又可以帮我们清晰地讲话，故填 F。
2. F 3. T 4. F
5. We can brush our teeth every morning and before bedtime, change our toothbrushes every three months, and visit the dentist twice a year.